changes until v0.96

Notable changes:

• (re)added wave().
• (re)added oval() and ovalfill().
• rework of clip(). Now accepts a callback instead of a Path2D.
• custom stat() indexes now can accepts strings and not only numbers.
• added pause() and resume() to pause or resume the engine loop (the “update” and “draw” events).
• added paused() (returns true when the engine is currently paused).
• added lastkey() (returns the last key pressed).
• disable mouse’s right click on canvas.

full changelog: https://github.com/litecanvas/game-engine/compare/46a55141debca8bada32d527962fa1a09554e024…HEAD