Load a preset using a midi button #445

Job	Run time
build-plugins (shrapnel, Release)	1m 32s
ctest (Release)	2m 15s
build-plugins (shrapnel, Debug)	1m 49s
flutter-analyze	1m 26s
ctest (Debug)	2m 10s
ctest-sanitize (Release)	3m 2s
ctest-sanitize (Debug)	2m 19s
build-firmware	1m 30s
flutter-format	36s
flutter-test	1m 40s
license-headers	45s
coveralls-finish	4s
	19m 8s

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