* added CanonicalFilePathCache to also reserve the initially recorded casing of file names
* use canonical file path cache to resolve filepaths in names of symbols (anonymous, static, ...)
* null reference fixes
* 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
* use canonical filepath cache in cxx indexer
* made constructors of FilePath explicit
* use FilePath at more places instead of string
* forward declares FilePath wherever possible
* replaced parser arguments by project specific IndexerCommands that know everything the indexer needs to know to do its job
* added different language and project specific indexers that know how to handle a certain kind of indexer command
* refactored FileManager and FileRegister to have less overhead
* removed no-rtti restriction for clang files in lib cxx
* uncommented deprecated interprocess code.
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