Separate includes into sections and alphabetize them

Okay, so basically here's the include layout that this game now
consistently uses:

[The "main" header file, if any (e.g. Graphics.h for Graphics.cpp)]
[blank line]
[All system includes, such as tinyxml2/physfs/utfcpp/SDL]
[blank line]
[All project includes, such as Game.h/Entity.h/etc.]

And if applicable, another blank line, and then some special-case
include screwy stuff (take a look at editor.cpp or FileSystemUtils.cpp,
for example, they have ifdefs and defines with their includes).

desktop_version/src/Map.h

@@ -1,15 +1,15 @@
 #ifndef MAPGAME_H
 #define MAPGAME_H
 
-#include "Tower.h"
-#include "WarpClass.h"
-#include "Finalclass.h"
-#include "Labclass.h"
-#include "Spacestation2.h"
-#include "Otherlevel.h"
 #include <vector>
 
+#include "Finalclass.h"
+#include "Labclass.h"
 #include "Maths.h"
+#include "Otherlevel.h"
+#include "Spacestation2.h"
+#include "Tower.h"
+#include "WarpClass.h"
 
 struct Roomtext
 {