Centralize all input handling in FlxG.input #199
Description
When Flixel was created, developers usually focused on a single platform. That's not the case anymore: games are targeting different platforms, e.g. mobile, console, pc, web, etc.
In order to simplify the input handling process, the idea is to create FlxG.input. It will be responsible for providing methods to read any type of input, e.g.:
FlxG.input.mouse.show();
if(FlxG.input.keys.any()) {
}
if(FlxG.input.fingers.any()) {
}
if(FlxG.input.fingers[0].x < 10 && FlxG.input.fingers[1].y > 50) {
}
if(FlxG.input.gamepad.justPressed("A")) {
}