Fixed old bug (all platforms): When typing text with dead-keys like ^ ` it would additionally type the character on same key for US-QWERTY keyboard.
Removed the "disable Unicode" option added in r814, no longer needed.
git-svn-id: svn://pulkomandy.tk/GrafX2/trunk@816 416bcca6-2ee7-4201-b75f-2eb2f807beb1