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/Game.cpp

@@ -1,27 +1,22 @@
-#include "Enums.h"
-
-#include "editor.h"
 #include "Game.h"
-#include "Graphics.h"
-#include "Entity.h"
-#include "Map.h"
-#include "Music.h"
-#include "Script.h"
-#include "UtilityClass.h"
 
+#include <sstream>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-
-#include <sstream>
-
-#include "FileSystemUtils.h"
-
 #include <tinyxml2.h>
 
-#include "Network.h"
-
+#include "editor.h"
+#include "Entity.h"
+#include "Enums.h"
+#include "FileSystemUtils.h"
+#include "Graphics.h"
 #include "MakeAndPlay.h"
+#include "Map.h"
+#include "Music.h"
+#include "Network.h"
+#include "Script.h"
+#include "UtilityClass.h"
 
 // lol, Win32 -flibit
 #ifdef _WIN32