Remove trailing whitespace from all files

Surprisingly, there's not a lot of it. There is, however, a lot of mixed
indentation in this project.

desktop_version/src/Entity.h

@@ -145,7 +145,7 @@ public:
     bool entityhlinecollide(int t, int l);
 
     bool entityvlinecollide(int t, int l);
-		
+
 		bool entitywarphlinecollide(int t, int l);
 		bool entitywarpvlinecollide(int t, int l);