Track names improvement

[MadMaxxx]

We already discussed it in the thread but maybe its better for you if i post it here.

Something like this
Bass
Lead 1
Lead 2
Rhythm 1
Rhythm 2

Since by the default the converter does export the highest diff only, the level in the name is not needed at all, maybe you can add the levels in the name only if a specific level is asked to convert.

I think it looks that way more polished.