Add toggleable numpad movement (Alt+Enter)

Ports the zMUD/CMUD numpad.set convention: plain numpad for normal
movement, Ctrl+numpad for moving up a level in that direction, and
Ctrl+Alt+numpad for moving down a level, all sent as literal MUD
commands via Accelerator. Alt+Enter toggles the whole set on/off (with
a sound + spoken confirmation) by clearing/restoring the accelerators,
so a disabled numpad types normally instead of doing nothing.

Cleared the numbers/*/-/+ entries in the world's native <keypad> block
since they'd otherwise double-send alongside the new Accelerator-based
bindings - left "." and "/" (hide/inventory) alone since those aren't
part of this feature. Documented the full three-layer key list and the
toggle in the readme.

readme.md

@@ -109,6 +109,17 @@ The soundpack mirrors game text into a separate notepad-style window titled "out
 ### Gag Manager
 - **Alt + F2**: Open the Gag Configuration menu (see [Gag Manager](#gag-manager) below)
 
+### Numpad Movement
+See [Numpad Movement](#numpad-movement) below for the full breakdown - summary:
+- **Alt + Enter**: Toggle numpad movement on/off
+- **Numpad 1-9, 0**: Move (with Numpad 5 as look, Numpad 0 as exits)
+- **Numpad \* / Ctrl + Numpad \***: In / out
+- **Numpad - / Numpad +**: Up / down
+- **Ctrl + Numpad 1-9** (except 5): Move up a level in that direction
+- **Ctrl + Numpad - / Ctrl + Numpad +**: Upstairs / downstairs
+- **Ctrl + Alt + Numpad 1-9**: Move down a level in that direction (Ctrl+Alt+Numpad 5 is "go")
+- **Ctrl + Alt + Numpad - / Ctrl + Alt + Numpad +**: Climb up / climb down
+
 
 ## Gag Manager
 
@@ -135,6 +146,40 @@ Press **Alt + F2** to open the Gag Configuration menu. From there you can:
 
 Your gags are saved to `gags.lua`, next to your world file (`worlds/Cosmic Rage/gags.lua`). It's a plain, human-readable file, so you can copy it to share your gag list with someone else or keep it as a backup. To load someone else's list, drop their `gags.lua` into your own `worlds/Cosmic Rage/` folder - this replaces your existing gags, so back yours up first if you want to keep it.
 
+
+## Numpad Movement
+
+The numpad can be dedicated entirely to movement, freeing you from typing full direction commands. It's on by default and works in three layers depending on what modifier you hold.
+
+### Plain numpad - normal movement
+- **Numpad 7 / 8 / 9**: Northwest / North / Northeast
+- **Numpad 4 / 5 / 6**: West / Look / East
+- **Numpad 1 / 2 / 3**: Southwest / South / Southeast
+- **Numpad 0**: Exits
+- **Numpad \***: In
+- **Ctrl + Numpad \***: Out
+- **Numpad -**: Up
+- **Numpad +**: Down
+
+### Ctrl + numpad - move up a level while heading that direction
+- **Ctrl + Numpad 7 / 8 / 9**: Northwest-up / North-up / Northeast-up
+- **Ctrl + Numpad 4 / 6**: West-up / East-up
+- **Ctrl + Numpad 1 / 2 / 3**: Southwest-up / South-up / Southeast-up
+- **Ctrl + Numpad -**: Upstairs
+- **Ctrl + Numpad +**: Downstairs
+
+### Ctrl + Alt + numpad - move down a level while heading that direction
+- **Ctrl + Alt + Numpad 7 / 8 / 9**: Northwest-down / North-down / Northeast-down
+- **Ctrl + Alt + Numpad 4 / 6**: West-down / East-down
+- **Ctrl + Alt + Numpad 1 / 2 / 3**: Southwest-down / South-down / Southeast-down
+- **Ctrl + Alt + Numpad 5**: Go
+- **Ctrl + Alt + Numpad -**: Climb up
+- **Ctrl + Alt + Numpad +**: Climb down
+
+### Turning it off
+
+Press **Alt + Enter** to toggle numpad movement on or off - useful if you need the numpad free for typing numbers instead. You'll hear a confirmation sound and a spoken message each time you toggle it. When it's off, the numpad keys behave normally again rather than doing nothing.
+
 ## FAQ
 
 **Q: My soundpack isn't working. What should I do?**