Added font and hero textures files.
Added Android icon.
Moved net asset classes and server comm classes to "net" package.
MINOR CHANGE: renamed arg to args in DesktopLauncher. Meh.
Added gdx-tools to Gradle build file for running Hiero.
Updated CredentialsListener and OHGame login windows.
Updated MenuScreen with UIGroup usage.
Added ViewDecks and NewDeck class/name selection to DeckManager.