Checkpoint 3 & 4

Forgot checkpoint 3 so it goes here.

I've been slacking but I'm going to get it together for checkpoint 5.

Made a bullet sprite and ported that along with the background sprite into the game with animated floor.

bullet------>

I made a bullet hell like attack, it's very useful for testing. I also added an invincibility toggle for testing.

Added an attack manager so that the boss will cycle through different attacks (when I have more than 1) (I also don't think it works right now)

Thinking about having attacks become harder when a certain time is reached, alongside having new attacks entirely.

Demo: (I know this is waaaaaaaay too hard but it was funny)