Make controller aiming analog

[McSinyx]

A few problems with this patch:

• UX for aiming stick customization must be changed entirely (to left/right options only)
• Aiming usually gets reset after the stick is released

The direction is also over-polling (updated on all controller analog events) but if restricted to just RIGHT{X,Y} it might not get updated at all. Perhaps it could be reduced to just attacks inputs 🤔

[dorkster]

Thoughts:

• I'd like to keep the "digital" mappings for aiming and have analog aiming be a separate option.
• We want to avoid manipulating the mouse here, since we generally warp it to (-1, -1) when using a controller. Instead, I think a better approach would be to add a "value" array like we have for pressing and expose event.caxis.value. It'd be a good idea to normalize this value so that it's between -1.0 and 1.0.
  • This change would respect the deadzone setting, which this PR doesn't currently do.
  • The mapping UX could remain unchanged.
  • Because the mouse wouldn't change, MenuActionBar::setTarget() would need to support this third method of targeting.
• I think I'm fine with the aim resetting when releasing the stick. Basically a way to "fine-tune" the digital aiming.

[dorkster]

I don't think this is correct, as it is handling the player clicking on an action bar slot as opposed to clicking on the play field.