Add JoyCursor module

[KeyWeeUsr]

Inspired a little bit by Touchring and Cursor modules, this module uses inputs from joysticks (2+ can navigate it) to create a single (no filtering by joystick ids), mouse-like navigation via axes and buttons. It has implemented:

• left click
• right click
• double click (two clicks)
• moving the cursor
• holding the button (+ moving at the same time)
• selecting
• scrolling (like with mouse wheel)

and all with an option to use only the joystick alone i.e. no Ctrl+E to activate it (although possible). A user can activate the module right from the joystick. If used in a game, this module could be (re)created when a player enters a menu and removed completely (stop(), so that it doesn't listen for joystick input) after the menu actions are finished.

There are two ways to activate and two behaviors for that. The cursor is resides at pos = [ -size[0], -size[1] ] in the beginning (and when at rest). When the cursor is activated through keyboard (Ctrl+E), it jumps right to the mouse's position. When activated through joystick such a behavior isn't really good because there are no bounds for the cursor, therefore a player has to be able to reset the cursor, thus when activated from joystick, it'll appear in the Window's center.

Also it's good to mention that mouse > joystick, which means that if mouse moves, the cursor moves with it no matter if it's controlled from joystick. This prevents issues of "losing" the JoyCursor widget in the world and prevents also glitches e.g. if joystick goes crazy for some reason and jams the axes on a specific value i.e. order in the hierarchy by reliability (mouse > joystick).

I've tested it on a TextInput and the only "failure" here is pretty much not being able to press Escape, but that's keyboard action (which can be handled by VKeyboard) when trying to escape a TextInput that's the same size as the Window. However, the JoyCursor is pretty much a simple widget (only position is manipulated), therefore to unfocus such a big TextInput it's enough to get out of its area and press left mouse button, which is the core function of this module.

For more details see this video comparing mouse and JoyCursor features.