feat: every key on the keyboard is bindable - the F-row, the six-pack, Caps Lock and the numpad

The platform gave these keys no code at all, so a game's rebinding screen could not take
one and nothing said why. Windows asked the active layout what they type and got nothing
(w_vk_char answers 0 for a key with no character); macOS let them fall through to
charactersIgnoringModifiers, which reports NSF1FunctionKey and its neighbours at 0xF704
and up - outside the 256-bit held set either way.

w_keyval and ev_keyval now name them, with the same codes on both: 132-143 F1-F12,
144-149 Home / End / PageUp / PageDown / Insert / Delete, 150 Caps Lock, 152-161 the
numpad digits, 162-166 its * + - . and /. The numpad's Enter is Enter.

Key.F1, Key.Home, Key.Numpad0 and the rest fold at compile time, and Input.key_label
names them without asking the layout - a key that types nothing is called the same thing
on every layout.

examples/library/input_typeless_keys.ludic covers the codes, the names, the held set and
the press edge; 150 passed in ludic-dev test, 33 in selfhost-test.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

runtime/native/cocoa.ll

@@ -380,6 +380,45 @@ special:
     i32 36,  label %vret
     i32 53,  label %vesc
     i32 51,  label %vbksp
+    ; the keys that type nothing: charactersIgnoringModifiers answers them with
+    ; NSF1FunctionKey and its neighbours, 0xF700 and up, which is outside the 256-bit held
+    ; set - so a game could not bind an F-key, Home, Delete or the numpad at all. They get
+    ; the same codes win32.ll's w_keyval gives them.
+    i32 122, label %vf1
+    i32 120, label %vf2
+    i32 99,  label %vf3
+    i32 118, label %vf4
+    i32 96,  label %vf5
+    i32 97,  label %vf6
+    i32 98,  label %vf7
+    i32 100, label %vf8
+    i32 101, label %vf9
+    i32 109, label %vf10
+    i32 103, label %vf11
+    i32 111, label %vf12
+    i32 115, label %vhome
+    i32 119, label %vend
+    i32 116, label %vpgup
+    i32 121, label %vpgdn
+    i32 114, label %vins
+    i32 117, label %vdel
+    i32 57,  label %vcaps
+    i32 82,  label %vnp0
+    i32 83,  label %vnp1
+    i32 84,  label %vnp2
+    i32 85,  label %vnp3
+    i32 86,  label %vnp4
+    i32 87,  label %vnp5
+    i32 88,  label %vnp6
+    i32 89,  label %vnp7
+    i32 91,  label %vnp8
+    i32 92,  label %vnp9
+    i32 67,  label %vnpmul
+    i32 69,  label %vnpadd
+    i32 78,  label %vnpsub
+    i32 65,  label %vnpdec
+    i32 75,  label %vnpdiv
+    i32 76,  label %vret
   ]
 vw:     ret i32 128
 vs:     ret i32 129
@@ -388,6 +427,40 @@ vd:     ret i32 131
 vspace: ret i32 32
 vret:   ret i32 10
 vesc:   ret i32 27
+vf1:    ret i32 132
+vf2:    ret i32 133
+vf3:    ret i32 134
+vf4:    ret i32 135
+vf5:    ret i32 136
+vf6:    ret i32 137
+vf7:    ret i32 138
+vf8:    ret i32 139
+vf9:    ret i32 140
+vf10:   ret i32 141
+vf11:   ret i32 142
+vf12:   ret i32 143
+vhome:  ret i32 144
+vend:   ret i32 145
+vpgup:  ret i32 146
+vpgdn:  ret i32 147
+vins:   ret i32 148
+vdel:   ret i32 149
+vcaps:  ret i32 150
+vnp0:   ret i32 152
+vnp1:   ret i32 153
+vnp2:   ret i32 154
+vnp3:   ret i32 155
+vnp4:   ret i32 156
+vnp5:   ret i32 157
+vnp6:   ret i32 158
+vnp7:   ret i32 159
+vnp8:   ret i32 160
+vnp9:   ret i32 161
+vnpmul: ret i32 162
+vnpadd: ret i32 163
+vnpsub: ret i32 164
+vnpdec: ret i32 165
+vnpdiv: ret i32 166
 ; kVK_Delete (51), the key marked delete or backspace: AppKit reports its character as
 ; NSDeleteCharacter (127), and Key.Backspace is 8
 vbksp:  ret i32 8

runtime/native/input.ludic

@@ -390,6 +390,22 @@ function input_key_label(k: int) -> string {
   if k == 129 { return "Down" }
   if k == 130 { return "Left" }
   if k == 131 { return "Right" }
+  # the keys that type nothing on any layout, so there is no character to show: the name is
+  # the same everywhere, which is why it is not asked of the layout
+  if k >= 132 and k <= 143 { return "F" + string(k - 131) }
+  if k == 144 { return "Home" }
+  if k == 145 { return "End" }
+  if k == 146 { return "PageUp" }
+  if k == 147 { return "PageDown" }
+  if k == 148 { return "Insert" }
+  if k == 149 { return "Delete" }
+  if k == 150 { return "CapsLock" }
+  if k >= 152 and k <= 161 { return "Num " + string(k - 152) }
+  if k == 162 { return "Num *" }
+  if k == 163 { return "Num +" }
+  if k == 164 { return "Num -" }
+  if k == 165 { return "Num ." }
+  if k == 166 { return "Num /" }
   var c = 0
   if is_windowed() { c = win_key_char(k) }
   if c <= 0 and k > 32 and k < 127 {

runtime/native/win32.ll

@@ -425,6 +425,42 @@ byvk:
     i32 18, label %alt
     i32 8,  label %bksp
     i32 9,  label %tab
+    ; the keys that type nothing, so w_vk_char answers 0 for them and they had no code at
+    ; all: a game could not bind an F-key, Home, Delete or the numpad, and nothing said why
+    i32 112, label %f1
+    i32 113, label %f2
+    i32 114, label %f3
+    i32 115, label %f4
+    i32 116, label %f5
+    i32 117, label %f6
+    i32 118, label %f7
+    i32 119, label %f8
+    i32 120, label %f9
+    i32 121, label %f10
+    i32 122, label %f11
+    i32 123, label %f12
+    i32 36,  label %khome
+    i32 35,  label %kend
+    i32 33,  label %kpgup
+    i32 34,  label %kpgdn
+    i32 45,  label %kins
+    i32 46,  label %kdel
+    i32 20,  label %kcaps
+    i32 96,  label %np0
+    i32 97,  label %np1
+    i32 98,  label %np2
+    i32 99,  label %np3
+    i32 100, label %np4
+    i32 101, label %np5
+    i32 102, label %np6
+    i32 103, label %np7
+    i32 104, label %np8
+    i32 105, label %np9
+    i32 106, label %npmul
+    i32 107, label %npadd
+    i32 109, label %npsub
+    i32 110, label %npdec
+    i32 111, label %npdiv
   ]
 up:    ret i32 128
 down:  ret i32 129
@@ -438,6 +474,40 @@ ctrl:  ret i32 17
 alt:   ret i32 18
 bksp:  ret i32 8
 tab:   ret i32 9
+f1:    ret i32 132
+f2:    ret i32 133
+f3:    ret i32 134
+f4:    ret i32 135
+f5:    ret i32 136
+f6:    ret i32 137
+f7:    ret i32 138
+f8:    ret i32 139
+f9:    ret i32 140
+f10:   ret i32 141
+f11:   ret i32 142
+f12:   ret i32 143
+khome: ret i32 144
+kend:  ret i32 145
+kpgup: ret i32 146
+kpgdn: ret i32 147
+kins:  ret i32 148
+kdel:  ret i32 149
+kcaps: ret i32 150
+np0:   ret i32 152
+np1:   ret i32 153
+np2:   ret i32 154
+np3:   ret i32 155
+np4:   ret i32 156
+np5:   ret i32 157
+np6:   ret i32 158
+np7:   ret i32 159
+np8:   ret i32 160
+np9:   ret i32 161
+npmul: ret i32 162
+npadd: ret i32 163
+npsub: ret i32 164
+npdec: ret i32 165
+npdiv: ret i32 166
 chars:
   %c = call i32 @w_vk_char(i32 %vk)
   ; the held set is keyed by the key, not the case: fold A-Z (Shift is its own code)