Hover text for settings

[Iritscen]

Many settings in AlephOne are not self-explanatory, as seen with my recent misunderstanding of what "Interface Button Sounds" means (sounds on the F-keys in-game, really?!). Other examples of unclear settings would be "3D Models" and "3D Perspective", but I could go on and on. Hover text that appears when mousing over a setting can provide useful elaboration on what each setting does.

[treellama]

We could definitely use better documentation of the settings (the wiki here would be a good place for that). However, hover text is not a good UI choice: it won't work for keyboard, controller, or touchscreen users.