Integrate code generator into PlatformIO

[vzahradnik]

Is your feature request related to a problem? Please describe.
TcMenu generated code is committed into regular repository.

Describe the solution you'd like
Platformio extension can be written to generate sources before building the project. There is no need to have the sources committed. Also, new sources are automatically regenerated on every project file change.

Additional context
As an inspiration, we can have a look at the nanopb github. In the manifest, there is a pointer to executable python script that is integrated with PlatformIO automatically.

https://github.com/nanopb/nanopb/blob/master/library.json