Use ENUM for radio module types

[cureton]

Convert radio module types to an enum,
Include radio module enum in config manager
Update code in radio.cpp to use enum rather than magic numbers
Update debug loging to use the correct module name.

[G4lile0]

Hi @cureton great idea! it makes it much clear. Thanks!

[cureton]

My pleasure @G4lile0, Thanks for nurturing the TinyGS idea and mantaining the system.