Make projectDir/srcDir optional (auto-calculated)?

[unserialize]

Currenly, projectRoot and srcRoot parameters are required, but probably, they may be calculated automatically.

Maybe, parameters > paths is something we might base on for calculating srcRoot. There may be multiple paths, may there be multiple src roots? Also, there is no way to exclude directories from .modulite.yaml searching.

But even if we use parameters > paths, how projectRoot should be calculated to locate composer.json and vendor/?