Moved CheatDialog and EventFlagDialog to dialogs.h and removed cheat.h. Fixed a crash on closing the event flags dialog. Fixed the timer data in CheatDialog being incorrectly written to the player time. Removed a couple of incorrectly marked translation strings.
Hooked the engine into ScummVM's speech/subtitle settings, and added two extra options for player and character speech. Added a custom settings dialog which gets shown both inside the Edit Game window and the in-game Settings.
Unmarked the string inside telephone.cpp as being translatable since it's an in-game string, and removed the file from POTFILES. Also added a comment explaining one of the strings inside cheat.cpp.
