ClassMapGenerator get all classes even vendor for root package

[Gashmob]

When getting classmap of root package, ClassMapGenerator also map vendor.

• It takes lot of time as there is many (many) classes
• We don't care about this classes

Solution: scan only some directories: src and include for example. It will be fast, but if someone uses another directory for its sources or have its sources at the root, it will be missed.