x86-64 beta catches up: ALT+F4, DrawPoly errors, SetPos touch events and more

Commit bb0975 on the x86-64 beta brings over the main changes from 5–12 October: the surface.DrawPoly error on fewer than 3 vertices, the mcore rope fix, ALT+F4 closing the game, the getmetatable() LuaJIT fix, the map compiler updates, Entity:SetPos running trigger touch events, menu state library removal, the HQ Eli face and the other fixes listed in commits 185851, efb205, 7be067, 71ca28, c18cba and 693484.