update smftrack to v0.8.1

[tools/smfimage] fixing go.mod

[tools/smfimage] fix image links

[tools/smfimage] fix the readme

fixing go.mod in smftrack

imported gitlab.com/gomidi/midi/tools/smftrack from

gitlab.com/gomidi/smftrack

make package drivers/internal/version a copy of golang-utils/version

in order to remove the only external dependency of gomidi/midi

lock os thread when playing to improve the timing

update smftrack to v0.8.1

[tools/smfimage] fix image links