Add sourcefile as makegen.xml option

- sourcefile will add additional individual files. Useful for when the
  user needs to manually specify files from existing repositories. If
  those repositories contain multiple files for different platforms
- Rework IncludeDeps to support sourcefiles

src/Utils.h

@@ -2,18 +2,18 @@
 
 #include <set>
 #include <string>
+#include <iostream>
 
 
 struct HFile
 {
   std::string filename;
-  std::string directory;
   bool isProjectHFile;
 
   std::string filepath;
 
   HFile(const std::string& filename, const std::string& directory, bool isProjectHFile)
-    : filename{filename}, directory{directory}, isProjectHFile{isProjectHFile}, filepath{directory+filename}
+    : filename{filename}, isProjectHFile{isProjectHFile}, filepath{directory+filename}
   {}
 
   friend bool operator<(const HFile& h1, const HFile& h2)