Update README.md
add hotkeys wiki
Added Dark Theme & Settings theme change
Added Dark Theme & Settings theme change
Delete app.css
Merge pull request #87 from ReEmM/master

Added loading status bar and deleted itag 84
added loading status bar
deleted itag 84 causing playback error
Merge branch 'master' of https://github.com/Atraci/Atraci
Merge branch 'master' of https://github.com/Atraci/Atraci
added rounded corner for loading bar
Merge pull request #91 from ReEmM/master

Added rounded corner for loading bar
Updated screenshot
Added donations link
Fixed donation text
refactor tracklist

1. make tracklist more OO
2. remove some global variables
3. fix popup menu in some special scenarios
Merge pull request #93 from EragonJ/refactor/tracklist

refactor tracklist