SchemaParser ignores type extensions for inherited types

The SchemaParser is responsible to apply the @inherit custom directive, thus apply all inherited fields throughout a type hierarchy. The inheritance did not took fields of type extensions into account. This misbehaviour was fixed.

(CMS-19073)

Cache eviction problem fixed in PageByPathAdapter

The related cache for the PageByPathAdapter was not evicted correctly, which may have cause memory problem.

(CMS-18966)