Optimization

[Feodor0090]

• [x] do not show memory
• [x] use char array for fps
• [x] use char array for score
• [x] use char array for combo
• [x] use char array for break countdown
• [x] inline bg fill method
• [x] cache some math around combo
• [x] #71
• [x] divisions in hud
• [x] Cache colors for notes to avoid blending each frame

[Feodor0090]

Dropping for now