Per spycrab’s request

Adds the new debug icon set and @4x versions of existing files

This adds new themed rating stars to all of the theme folders, with the
intent to eventually replace the awful old ratings stars in
sys/resources. I’m not a coder so it will be up to someone else to use
these files to replace the ratings stars in WX and Qt. Their dimensions
are the same as the old ones, so it should be pretty easy to implement,
though it will require moving over to theme-able files and supporting
HiDPI for them.

@4x files are present for future proofing / possible android usage.

All files have been optimized with opti-png.

fileplatform is moved so it's in the same place as the other platform
icons, and nobanner is moved just because it fits better in Resources.
Both of them were identical in all of Dolphin's themes.

Fixed a TON of structuring, formatting.

removed README.txt files from themes at MaJoR's request

Added platform icon for ELFs/DOLs

Removed audio.png