Additional settings will break compatibility with old ones

[Loobinex]

What will happen is that all settings get scrambled (or shifted down the list).

Desired behavior would be for the game to recognize the settings format has changed, and either: A) Pick up the default setting for the new one and keep the other settings B) Delete settings.dat restoring all settings to default.

Steps to reproduce:

1. Have default or custom settings from the master branch
2. Build the code from PR #1088
3. Install that version, start a level
4. Press for example P to Pause or Esc for menu and notice something else will happen.

[walt253]

Related issue: https://github.com/dkfans/keeperfx/issues/3329

[SimLV]

We have to put settings into toml file instead of settings.dat with some sane names. So

[shortcuts]
navigate_heart = "h"

will be future proof until we rename some of these actions