Added the first test shop UI, second world, the transitioner for it and so much more!

Devlog #3 for Evolution game
It’s been another while, thus it’s time to report. As of this time I added in first and basic test shop UI that gets shown at the right time and can be updated through scripts quite easily.
Enemies now also despawn when they reach the end, as well as the projectiles to prevent lag over time.
Along these I made some several smaller changes, but these are not all that important to mention here.