Added game speed button and other changes

Game speed button with up to 4/5 speeds.
Debugging tools option to enable non-playable changes.
Cheat window is now a setting.
Game speeds 5-7 are removed.
Game speed 8 added with enabling debugging tools.
Windows and news ticker update once per tick instead of based on game
speed.

src/localisation/localisation.h

@@ -27,6 +27,7 @@
 #include "string_ids.h"
 
 void format_string(char *dest, rct_string_id format, void *args);
+void format_string_part_from_raw(char **dest, const char *src, char **args);
 void generate_string_file();
 void error_string_quit(int error, rct_string_id format);
 int get_string_length(char* buffer);