Implement Assign section

[schulz-alexander]

see also #19

[DrEVILish]

The previous title wasn't that bad. 😆

Feature Suggestion:
On Full size X32 use the Mute Buttons as extra "fixed" assignment buttons.

[schulz-alexander]

The goal is to allow to assign anything to every button/fader/encoder on the X32. The backend is already implemented and I used this to implement the mute groups.

stay tuned 😎

[schulz-alexander]

First iteration of the new configuration page for user defined controls

[schulz-alexander]

Implemented Banking, now we can assign every Mixerparameter.

Channel Mode

Bank A is configured in "Channelmode" (new Feature 🚀 ), the two buttons act as Solo and Mute

Classic Mode

Bank B is configured in "Classic Mode" like the original firmware, but we show the name of the channel (new Feature 🚀 ) instead of just the "chxx" number like in the original firmware.

Classic Mode + "Indirect Addressing"

Bank C has Encoder 1 bound to the Gain of the selected channel - so indirect addressing (Mixerparameter SELECTED_CHANNEL) also works 🚀

[schulz-alexander]

The Page Setup -> Surface needs a lot of work. It should be simple, but we have to choose MixerparameterActions for every binding to a Mixerparameter.

The goal for the future is, that the user has only to choose the Surface Element, the Mixerparameter and if needed the Channel.