Removed .fnt files.
Changes GenerateSkinMojo.
Changes ExtendedSkinLoader.
Changes WidgetBuilder to use Gdx.graphics.getDensity().
Small fixes
Merge pull request #906 from RotaruDan/fontSize

Font size
Fixes Tabs not requesting rendering.
Added xxxxhdpi skin for Nexus 5/10
Merge pull request #907 from RotaruDan/tabsFix

Fixes Tabs not requesting rendering.