Refactor midi device code

...main/java/de/tobias/playpad/action/mapper/MidiMapper.java

...pad/action/mididevice/DeviceColorAssociatorConnector.java

...in/java/de/tobias/playpad/midi/device/DeviceRegistry.java

...ias/playpad/launchpadplugin/impl/LaunchpadPluginImpl.java

...tobias/playpad/launchpadplugin/midi/mk2/LaunchPadMK2.java

.../de/tobias/playpad/launchpadplugin/midi/s/LaunchPadS.java

...Launchpad/src/main/resources/lang/launchpad_de.properties