Load a preset using a midi button #440

Job	Run time
ctest-sanitize (Release)	3m 19s
ctest (Release)	1m 50s
build-plugins (shrapnel, Release)	1m 52s
ctest-sanitize (Debug)	3m 23s
ctest (Debug)	1m 46s
build-plugins (shrapnel, Debug)	1m 32s
build-firmware	1m 43s
flutter-analyze	1m 43s
flutter-format	56s
flutter-test	1m 57s
license-headers	55s
coveralls-finish	0s
	20m 56s

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