Difficulty UI redesign

[mmmdule]

Perhaps difficulty toggling could be done with a button like the one in the High Scores scene.

This button would change the difficulty PlayerPref, and after that it could reload the scene (easier and uglier) or restart all the star scripts.

The star scripts could just have the Start() method copied to OnEnable which would be skipped the first time with a bool check. (bool skip is false at the beginning of the scene, the difficulty change sets it to true, disables and enables the Star Scripts)

The scene with the difficulty explanations could be moved to instructions as a page 2 that is accessed by an arrow like in the level select.