Major Performance Optimizations

[FelixKratz]

This is a full rewrite of the entire drawing logic of the bar. The cpu utilization, especially in animations, should be 3-6x lower than before. But since I have rewritten most of the drawing logic some testing has to be done before I merge this into master.

Everything should look and work exactly like before, just much faster.
So if you want to help me with the testing of this implementation please do so by running the following commands:

git clone https://github.com/FelixKratz/SketchyBar.git SketchyBar
cd SketchyBar && git checkout picky_redraw
brew services stop sketchybar && killall sketchybar
make && ./bin/sketchybar

see if everything is still working and looks the same as before. Please also report back if everything still works like before.

I will test this new implementation myself for a week at least before merging it to master and creating a new release.

[FelixKratz]

I think this should be save to merge for now. Testing continues on master, so please open an issue if you encounter problems.