3.5 keybinds are broken in 4.1

[Koopa1018]

Describe the bug
4.1 builds do not interpret saved 3.5 keybinds correctly. The default 3.5 arrow key mapping appears as Ctrl+, and does not respond in-game.

The problem also applies in reverse--3.5 builds interpret keybinds from 4.1 as .

To Reproduce

1. Run release v0.1.6.alpha and reset keybinds to default.
2. Close 0.1.6.alpha and run master branch. Attempt to control Mario.
3. Reset keybinds to default. Attempt to control Mario.
4. Close master branch and run 0.1.6.alpha again. Attempt to control Mario.
5. Reset keybinds to default. Attempt to control Mario.

Expected behavior
4.1 builds do not produce invalid results when loading 3.5 keybinds. At minimum, invalid keybinds should be reverted to default. Ideally, 3.5 keybinds are automatically upgraded to 4.1-compatible bindings.

(Loading 4.1 keymaps in 3.5 seems unnecessary, but users should probably be informed that "keymaps in the latest version won't load correctly in v0.1.6.alpha or earlier" or something to that effect.)

Screenshots
How 3.5 keybinds look in 4.1:

And 4.1 keybinds in 3.1:

System Information

• OS/Browser: Windows 10 desktop build + editor
• Game version: master and v0.1.6.alpha
• Other specs:

Additional context
N/A