Lua binding for SDL_GetKeyName, two missing scan codes
See merge request OpenMW/openmw!1450
(cherry picked from commit d86e7d4c9a28bc96af0a5638b26879fa49b8a847)
9a073baa Add Apostrophe and Period scan codes
d66f3a35 Add getKeyName to Lua input API
ed64add9 Replace mentions of KeyEvent with KEY