Merge F5-menu with GMM
currently with SCUMM engine, there is the F5 menu that you can bring up, and the GMM that is accessible by Ctrl+F5. Both menus look very similar and have almost identical options. The differences I see as a user are that the F5 SCUMM engine specific menu has an "About" button which shows information about ScummVM as a whole IIRC and that is not there in the GMM. And the second difference is that in the GMM there is the "Return to launcher" button that is not in the SCUMM engine F5 menu. For a user these two menus are confusing IMHO. So I suggest merging these menus, meaning that the "About" button from the SCUMM engine specific F5 menu should be moved to the GMM, as it shows information about ScummVM as a whole anyway and removing the SCUMM engine specific menu, maybe if possible mapping F5 also to the GMM.
Ticket imported from: #2795365. Ticket imported from: feature-requests/514.