add team screen
update HomeScreen and TeamScreen listeners
init FightScreen
add fighter class and add ResourceUtil based on Skin, AssetManager.
Testing Action to Image with customized draw funciton
upgrade libgdx to latest version
add batch.Draw Tests
add melee attack
layout the fighters and enemies
init global map
Do FightScreen refactor: load fighters info from file and rebuild
structure.
enhance fight screen
add ReturnActor
HomeScreen Refactor: using a simple screen instead.
add FighterListScreen
deprecate TeamScreen
init FormationScreen
enhance FormationScreen: adding skills formation.
deprecate FontLoader & ResourcesLoader
add abstract class AbstractCoordinateManager & interface CoordinateActor
to simplify coordinate actor implementation.