data: Added HeaderSearchPaths to Application- and ProjectSettings

This change allows for parsing of a real codebase by specifying the system header search paths in
ApplicationSettings.xml and the additional header search paths in ProjectSettings.xml.

Both settings files are now documented in ApplicationSettings_template.xml and ProjectSettings_template.xml, which show
all possible settings for each file.

This change also fixes some parsing edge cases that occured.

src/lib/data/parser/ParseLocation.cpp

@@ -24,5 +24,12 @@ ParseLocation::ParseLocation(
 
 bool ParseLocation::isValid() const
 {
-	return startLineNumber > 0 && endLineNumber >= startLineNumber;
+	if (startLineNumber == endLineNumber)
+	{
+		return startLineNumber > 0 && startColumnNumber <= endColumnNumber;
+	}
+	else
+	{
+		return startLineNumber > 0 && startLineNumber < endLineNumber;
+	}
 }