data: saving locations of return and parameter types

This change introduces the structure ParseTypeUsage for passing information about type usage from the parser to it's
client. It is used for passing data type and location information about return types and parameter types, which now
get saved to the corresponding edges in the Storage.

src/lib/data/parser/ParseLocation.cpp

@@ -12,3 +12,8 @@ ParseLocation::ParseLocation(
 	, endColumnNumber(endColumnNumber)
 {
 }
+
+bool ParseLocation::isValid() const
+{
+	return startLineNumber > 0 && endLineNumber >= startLineNumber;
+}