adding 4ms modules

[dromer]

Will need quite some custom work.

Also noticed that there is some networking code, but not sure if that also runs in the VCV module itself or it's only for the Meta eurorack module.

[falkTX]

seems like this needs c++17 too

[dromer]

C++20 even? 🤔

4ms/lib/CoreModules/4ms/4ms_element_state_conversions.hh:13:66: error: ‘requires’ only available with ‘-std=c++20’ or ‘-fconcepts’

[falkTX]

could be, but then I dont think they are building with the regular Rack toolchain which would be a problem.
but well we can just check the source...

https://github.com/4ms/4ms-vcv/blob/main/CMakeLists.txt#L5 says C++20 😞

We can try to build with C++17, but if it fails it is best to give up.

[falkTX]

Yeah they have this nasty thing in there https://github.com/4ms/4ms-vcv/blob/main/RackSDK.cmake#L43

Their CI uses a custom docker image based on the Rack SDK, for getting gcc-13
qno/rack-plugin-toolchain@v2...4ms:rack-plugin-toolchain:v2

No point on trying here, I am closing the PR as this is not mergeable.