Turn map.contents into a plain array

map.contents always has 1200 tiles in it, there's no reason it should be
a vector.

This is a big commit because it requires changing all the level classes
to return a pointer to an array instead of returning a vector. Which
took a while for me to figure out, but eventually I did it. I tested to
make sure and there's no problems.

desktop_version/src/Finalclass.h

@@ -5,12 +5,11 @@
 #include "Entity.h"
 
 #include <string>
-#include <vector>
 
 class finalclass
 {
 public:
-    std::vector<int> loadlevel(int rx, int ry);
+    const int* loadlevel(int rx, int ry);
 
     std::string roomname;
     int coin, rcol;