[third_party] port latest changes from QtAwesome
fix a typo
Merge pull request #149 from Chilledheart/patch-1

fix a typo
Merge pull request #146 from Chilledheart/qtawesome_backport

[third_party] port latest changes from QtAwesome
try to fix icons problem on HDPI screens
implementation of isHighDPI for cocoa
remove fontawseome icons; fix mac focused border problem