Config checker

[metux]

What is the problem you are trying to solve

Current yaml config allows for lots of subtle mistype errors that are hard to track. Thus would be nice having a checker tool that looks for the most common errors.

Describe the solution you like

important checks / common errors:

• per-feature settings:
• • look for ==xxx" instead of =feature/)=[y|n]
• • look for misspelled features
• • look for misspelled feature values (depending on feature variable type: eg. bool may only be "y" or "n"
• feature settings
• • check for default, eg. bool may only be "y"/"n", not "true"/"false"
• potentially missing c/flags, c/libs (might actually be intended)
• references to empty variables caused by misspelling (ie. referenced var is missing, but some w/ slightly different name exists)

Additional context

No response