Commit every @2x image and new @1x images.
Update property lists to be resolution-agnostic.
Non-blurry debug tab icon.
Corrected @1x Genesis regional icon.
Sharper mixed state for menu items.
Tweaked @1x Famicom artwork, revealing expansion port.
Switch to a bespoke @1x PSX library icon.
Update GenesisSystemController to be region-friendly.
Tell Xcode about all the shiny new files.
New controller prefs background by Mucx.
Crushed all images in ImageOptim.
Correct hud_volume size (@2x version was bigger)
Fix some Retina regressions caused by ImageOptim.
Fix sizing of volume images in HUD.
Merge pull request #638 from RickyRomero/master

Retina graphics: first pass