* Allow theming of powerup/attachment icons
Icons were optimized with `pngquant` then `optimize_data.sh`
* Change help screens to use icons from icons folder rather than `models`
* Implement box model spacing for skin elements
* Account for padding when spacing out on-screen keyboard
* Fix padding for Tutorial button on Help screen
* Reduce spacing between tabs
(Also removed a couple duplicated files.)
* Change verticalTab margin as per Benau's request
Uses `vborder_out_portion`, which is how it was done before.
* Remove duplicate files
* Adjust spacings after PNGs were adjusted in a previous commit
* Improve spacing of verticalTabs
* Slightly increase the tabbar width in the Options screens
* Slightly increase the tabbar width in the help screens
* UI fixes && Icon support for powerups
* Better loading icon size
* Fix#4145
* Fix a small bug
* Add alternative icon support & avoid duplicating icons
* Change arena addon icon
* Categorize UI
* Give small margin
* Better icon size in help
* Several screen fix
* Fix bug
* Better GP line size
* Give more space to texts
* Better size