Add controller-based conditional around the Inform TIMER instruction

[ted-miller]

Fixes #166 Based on https://github.com/gavanderhoorn/motoros2/commit/6a79f9bf9fe28e09c0c2f9f3e5d45eeadd0e07e1

Some controllers use three-digits for the T tag. Others use two.

[gavanderhoorn]

I've tested the FS100 'side' to this, so I know it works there.

Extrapolating, the other conditionals should be OK as well.