data: parsing file dependencies

This change adds the node NODE_FILE to the graph and the edge EDGE_INCLUDE, which determine the dependencies between
files by parsing the include preprocessor directive. File nodes can be searched and displayed in the GraphView as file
dependency graph. The filter "file" allows for selecting all files. The file depency information is used on project
refresh do determine which files need to get reparsed.

src/lib/data/parser/cxx/PreprocessorCallbacks.cpp

@@ -0,0 +1,52 @@
+#include "data/parser/cxx/PreprocessorCallbacks.h"
+
+#include "utility/file/FileManager.h"
+#include "data/parser/ParserClient.h"
+#include "data/parser/ParseLocation.h"
+
+PreprocessorCallbacks::PreprocessorCallbacks(
+	clang::SourceManager& sourceManager, ParserClient* client, FileManager* fileManager
+)
+	: m_sourceManager(sourceManager)
+	, m_client(client)
+	, m_fileManager(fileManager)
+{
+}
+
+void PreprocessorCallbacks::InclusionDirective(
+	clang::SourceLocation hashLocation, const clang::Token& includeToken, llvm::StringRef fileName, bool isAngled,
+	clang::CharSourceRange fileNameRange, const clang::FileEntry* fileEntry, llvm::StringRef searchPath,
+	llvm::StringRef relativePath, const clang::Module* imported
+){
+	const clang::FileEntry* baseFileEntry = m_sourceManager.getFileEntryForID(m_sourceManager.getFileID(hashLocation));
+	if (fileEntry && baseFileEntry)
+	{
+		std::string baseFilePath = baseFileEntry->getName();
+		std::string filePath = fileEntry->getName();
+
+		if (m_fileManager->hasFilePath(baseFilePath) && m_fileManager->hasFilePath(filePath))
+		{
+			m_client->onFileIncludeParsed(
+				getParseLocation(fileNameRange.getAsRange()), baseFileEntry->getName(), fileEntry->getName());
+		}
+	}
+}
+
+ParseLocation PreprocessorCallbacks::getParseLocation(const clang::SourceRange& sourceRange) const
+{
+	if (sourceRange.isInvalid())
+	{
+		return ParseLocation();
+	}
+
+	const clang::PresumedLoc& presumedBegin = m_sourceManager.getPresumedLoc(sourceRange.getBegin(), false);
+	const clang::PresumedLoc& presumedEnd = m_sourceManager.getPresumedLoc(sourceRange.getEnd(), false);
+
+	return ParseLocation(
+		presumedBegin.getFilename(),
+		presumedBegin.getLine(),
+		presumedBegin.getColumn(),
+		presumedEnd.getLine(),
+		presumedEnd.getColumn() - 1
+	);
+}