Load a preset using a midi button #444

Job	Run time
build-firmware	1m 31s
build-plugins (shrapnel, Release)	1m 51s
ctest (Release)	1m 59s
build-plugins (shrapnel, Debug)	1m 37s
ctest-sanitize (Release)	2m 43s
ctest (Debug)	2m 5s
flutter-analyze	1m 23s
ctest-sanitize (Debug)	2m 3s
flutter-format	33s
flutter-test	1m 57s
license-headers	57s
coveralls-finish	5s
	18m 44s

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