Improve performance

[alloncm]

In order to run on weaker hardware I want to improve performance as much as I can.

In order to do that I opened a new branch called feature/mt, a PR will be opened soon.

In this branch I will convert the program to 2 threads (or maybe 3) in order to move the IO from the logic thread.
When doing this I need to figure out how to draw properly without busy waiting in the IO thread for new frame buffer from the emulation thread while not making the window unresponsive in case the PPU is turned off.

This be achievable with blocking function that has a timeout, when the timeout is set the function will update the UI (accept new events) and than block again for the amount of time.

[alloncm]

When the APU is off it keeps resetting all its channels, maybe adding a flag whether it should reset them on not (based on if its just turned off) or maybe reset them upon turning off (like the PPU).