Create a better streamlined system for powerups.

[doonv]

Currently in the game, there's no streamlined way to make powerups. So the implementation of these powerups are somewhat poor and inconsistent.
For example the bus powerup: The collision and sprite are always in the player scene, which is not much a problem now (Even tho it made the player thicker than he needs to be). But this is the type of game that will have like 10 powerups in the same room. That's a bit problematic.

We should make a streamlined system so implementing powerups is not only easier but doesn't cause a billion issues. I'm not sure how we could implement this. But this is the reason this is in the discussions tab.

[harperposten]

I made Powerup.gd to make it easier to make them (and I fixed the collision issue I caused). The sprite thing is an issue, but I did that because I don't know enough about Godot. If there's a way to change the player sprite without having the new sprite/collision in the Player scene, then that's good, I just don't know it. I think a big issue is that functions keep getting put in Player.gd (I'm guilty of this, too), but I'm not sure where else to put functions for stuff that the player does