* rework of the input handling, including different gamepad and keyboard
* rework of the input handling, including different gamepad and keyboard
* first version of a too complex inputHandler based on phaser3-merged-input
* removed useless control management and kept it simple for our use case, investigating to put out button_XX()
* renamed inputHandler to inputController
* aggregate directions and some action into a same method + fix menu return value
* added back repeated input feature on keeping down a key
* cleanup + return type
* fix submit/action doing two things simultaneously, still same behaviour as before
* extracted UI inputs out of battle-scene
* tab -> spaces
* tab -> spaces what about now github ?
