Tenhou UI+ for /3/ av Careka

Improve the overall experience of playing on tenhou.net/3/ and ron2.jp/3/

Improvements:
-widescreen support
-objects resized
-new animations
-new button placements and styles
-click feedback
-and more

Current limitation:
When setting a new background in Tenhou, it's still necessary to press F5 and reload the page.