Added GoatTracker Export

Hello!

Time for another update!

Version 0.0.25 adds an experimental GoatTracker export functionality for the full version of the editor.
This might be useful for those who want to create music for the C64's SID chip.

Enable the export feature by selecting File -> Settings -> Experimental -> Enable Experimental Features.

Here are some examples of output using the action template:

You will most likely consider this an extremely useless feature, but for me this was the most fun and rewarding experience in 2020 by far.

I was lucky to grow up with the harsh and intense sound from the SID chip and the fantastic composers of that time.

Bye!