assets: use "Black Vortex" for test music
add CREDITS.md
clean
CREDITS: update
gui: extend css for HudWelcome
add InputMapper + display of control.
resize Textures/Inputs to be power of 2 (64x64 or 128x128)
move classes form jme3_skel to jme3_ext
add InputTextureFinder.findPath
remove PageManager.registerAction
move helpers from Main to SetupHelpers
merge RawInputListenerLatest behavior into InputMapper + InputMapperHelpers
add exit Commands + usage into PageSettings (~ back) and PageWelcome (~ quit)
remade InGame : show a sphere (player) who spawn command into screen (as billboard).
add an undef texture for Inputs
InGame: create a basic environment (a grid)
cleaner HudInGame
InputMapper manage its own software "deadzone" for joystick'axis, to avoid noise event.
InputTexture, fix some wrong mapping.
clean imports