Added ability for router to call sansrts.pl

When the router is installed, sansrts.pl is stored in
PREFIX/share/sansgrid right now.
Still have a problem sourcing if not installed

Even if the router isn't installed, it'll look for the perl script in
PREFIX/share/sansgrid, which is a problem, because it's technically not
installed there yet... So I need to figure out either
1. A better method to get the script path
2. A way to check multiple locations for the script
Added a function that gets the payload type

This function returns a payload type that's easier to parse. Instead of
all the different types of chirp, for instance, you get one
SG_DEVSTATUS_CHIRPING.
Added framework for intrarouter --> structure
Merge branch 'testing'