v0.23 - add cutscene director + refactor of camera

This update (v.0.23) covers a lot of cool stuff:

- First of all, the cutscene manager, which is something that I never thought of before, and that works as an alternative to create scenes with infinite timelines. We can decide the flow of the cutscene through code and it can scale pretty easy!  Thanks again, Nico (the guy behind Dreamed Away) for the advice on how to do this!

- Also, I added the circular transition you will see at the end of the initial cutscene. I basically followed this tutorial  here and adapted to my needs.