MouseLock & PointerLock

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This extension provides a unified API for "mouselock" on desktop platforms and web (HTML5).

Foremost intended for making web-based games with camera rotation, but has numerous other uses.

Included functions are:

• mouse_lock(): Locks the mouse cursor at current position.
• mouse_unlock(): Unlocks the mouse cursor.
• mouse_delta_x, mouse_delta_y: Mouse movement since the last frame (if locked),
• mouse_lock_update(): Must be called once per frame. Updates mouse_delta_* variables.
• mouse_is_locked(): Returns whether the mouse is currently locked.
  (on HTML5, mouse can only be locked after a click on the game)