* fixed comment locations have been saved to wrong database table
* fixed usage of tryGetRealPathName on windows
* used real filename in PreprocessorCallbacks, DiagnosticsConsumer and CommentHandler
* fixed crash in IncludeValidation when only one source file was checked
* moved storage related classes to data/storage folder
* implemented recording c++ unions as NODE_UNION instead of just using NODE_TYPE
* added transformation to merge anonymous classes/structs/enums/unions and typedef nodes
* added tests for this transformation
* added setting for enabling/disabling this transformation