Improve xml loading

.../main/java/de/tobias/playpad/trigger/CartTriggerItem.java

...ain/java/de/tobias/playpad/trigger/VolumeTriggerItem.java

...re/src/main/java/de/tobias/playpad/pad/PadSerializer.java

...ain/java/de/tobias/playpad/pad/PadSettingsSerializer.java

...java/de/tobias/playpad/project/ProjectSyncSerializer.java

...in/java/de/tobias/playpad/registry/ComponentRegistry.java

.../de/tobias/playpad/registry/DefaultComponentRegistry.java

...lCore/src/main/java/de/tobias/playpad/tigger/Trigger.java

...ain/java/de/tobias/playpad/equalizerplugin/Equalizer.java