pic12si2c.asm new commands for event handling.

These have not been tested yet.

0xA0 disable event triggered tasks

0xA1 enable event triggered tasks

0xA2 read event register

0xA3 reset event register

0xA4 0xNNNN GP0 input at zero triggered task command and parameter byte

0xA5 0xNNNN GP1 input at zero triggered task command and parameter byte

0xA6 0xNNNN GP4 input at zero triggered task command and parameter byte

0xA7 0xNNNN GP5 input at zero triggered task command and parameter byte

0xA8 0xNNNN comparator triggered task command and parameter byte