Keybindings fixes

[Qrox]

Summary

None

Purpose of change

Add missing keybindings to key code mode and adjust existing ones.

Describe the solution

1. Convert "keyboard_any" bindings with invalid qwerty key code into "keyboard_char" and "keyboard_code" bindings.
2. For bindings with only "keyboard_char", add missing "keyboard_code" bindings or convert to "keyboard_any" bindings.
3. Add '=' to directional keybindings previously bound to "+". "+" is kept for symbol mode in case the player is using a different keyboard layout, but "shift =" is removed from key code mode because the mode only supports qwerty layout currently so the shift key is not needed. Also add a missing "KEYPAD_MINUS" to an action bound to "-".
4. Fix incorrect direction of '-'/'+' keys in mod manager
5. Add myself as a reviewer of keybindings.json so I can suggest corrections to the file in the future.

Describe alternatives you've considered

Testing

Tested as many bindings as possible in key code mode and symbol mode. Some bindings are hard to reach so I double checked the code to ensure they are fine.

Additional context