Also add setcursor2, esetcursor2, and draw protocol encoding. Calls to the old setcursor, esetcursor create a 32x32 by pixel doubling when needed.

Otherwise, the type of the expression will be int, and if written to a uvlong (or just a ulong on most 64-bit systems), it will be sign-extended. This was going on in drawfcall with Mouse.msec, which is declared as a ulong. This fix assumes that the protocols only send unsigned numbers, which is true.