Implement Surface Manager

[borzel]

Currently the mapping of surface elements like LEDs, buttons, encoders and faders to the internal business logic is made using big switch() statements 🤔

The goal is to implement a flexible surface manager that can handle different modes of operation, banking within and aroung these modes, flexible use and assignment of Mixerparameters, user layer(s), ...

The goal: Lego for Mixers / Configure your own mixer!
Maybe we can get as good as Mixingstation 💭

[butrus]

Maybe we can have some sort of configuration / mapping files and a binary / daemon that reads those files and acts upon?
We probably need something binary because of memory constrains which means some sort of "compiler" from let's say XML or JSON or something like that.
Or do we have a JSON library with a very small memory footprint?

[borzel]

I want it to be configurable in the UI.

[borzel]

There are no memory contrainst that should affect us. Implementation in C++, like the rest of the current system.

[borzel]

Hardware Inputs

• fader value
• encoder turned
• button/encoder pressed
• button/encoder released
• button/encoder pressed while other button/encoder was pressed

Actions

• call a function
• set fader value to mixerparameter
• toogle mixerparameter
• set mixerparameter
• change mixerparameter
• change surface mode (banking, send on faders, text input, ...)