data: Refactored ParserClient API to return and use Ids instead of NameHierarchies for faster indexing

* Pass NameHierarchy to record new symbol returning an Id
* Cache symbol Ids in Parser implementation
* Reuse symbol Ids as reference when recording related data
* Pass FilePath to record new file returning an Id
* Cache file Ids in CanonicalFilePathCache
* Store file Id in ParseLocation instead of FilePath

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src/lib/CMakeLists.txt

@@ -202,7 +202,6 @@ add_files(
 	data/parser/ParseLocation.h
 	data/parser/Parser.cpp
 	data/parser/Parser.h
-	data/parser/ParserClient.cpp
 	data/parser/ParserClient.h
 	data/parser/ParserClientImpl.cpp
 	data/parser/ParserClientImpl.h