Fix gdlint errors

[squidt]

• IMPORTANT: 'arcade_hoops_ctrl.gd' line 96 had a 'tween.kill' that does not call 'tween.kill()'. It has been removed to preserve identical functionality while removing a glint error. It is unclear if this needed to be called but was missing.
• Reorder variables
• Lessen lines over 100
• Remove trailing whitespace
• Prepend "_" to unused function parameters

The most important fix would be to 'start_xr.gd' which reorders the static variable to the top. I've seen at least 2 PRs fail gdlint checks due to this file.

[squidt]

thanks! yea I at first I was just gonna fix the start_xr file then figured I'd do the rest while i was there since it's an accessible contribution