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.

bin/app/data/src/header.h

@@ -1,3 +1,9 @@
+#include <string>
+#include <vector>
+#include <map>
+#include <memory>
+#include <functional>
+
 const bool *abd(int abc, int bca);
 
 bool const *abc(int a, int b);