CGE2: Remove unused constant in Talk, fix a warning
CGE2: Update another warning
CGE2: Rework loadUser().

Now initToolbar() works as intended both when starting a new game or when loading an old gamestate.
CGE2: Fix initialization of sound switches on the toolbar.
CGE2: Rename kSoundSwtichRate  to kVolumeSwitchRate.
CGE2: Fix broken compilation by previous commit.
CGE2: Remove useless TODO comment.
CGE2: Implement the music volume button on the toolbar.
CGE2: Implement the sfx volume button on the toolbar.
CGE2: Get rid of unnecessary variables.
CGE2: Fix optionTouch().

Now you can't change the sound options via the toolbar if the Mute All option is checked in the GGM/Launcher.
CGE2: Repair checkVolumeSwitches().
CGE2: Fix optionTouch().
CGE2: Refactor optionTouch().
CGE2: Refactor optionTouch().
Revert "CGE2: Refactor optionTouch()."

This reverts commit 85909a52e42fb1151322bd7b5601d042ff844fad.
CGE2: Now refactor optionTouch() the right way.
CGE2: Rearrange things a bit in cge2.h.
CGE2: More refactoring in cge2.h and cge2.cpp.
CGE2: Repair display of version and translation strings.