Avoids propagating headers into scopes where they're not necessary.
Also uncovered reliance on an indirect inclusion within
CheatsManager.cpp, which is now fixed.
If a user indicates that they want to clone and edit an AR code, then
click cancel on the following dialog, we shouldn't actually clone the
code.
We also shouldn't resave the codes if the edit dialog is opened and then
closed again via cancel, as there's nothing that actually changed. This
way we don't perform disk accesses unless they're actually necessary.
