Zynseq - A native step sequencer

@riban, master of sequencers, if your development branch is synced with master, i would merge when you want. Simply tell me when …

I suppose we have to look a good place for the map files and so on … what do you think about using this:

/zynthian/zynthian-data/zynseq

and this for the “user” data, like patterns, songs, etc.:

/zynthian/zynthian-my-data/zynseq

Regards,