minor improvement to make sysinit_run a constructor, so don't need
to manually call it anymore...

This required updating the linker script for the l1 part to include
the linkerset section..

it's promoted to int (signed) which when shifting into the sign bit is
UB per §6.5.7 ¶ 4 of the C99 spec.

The first one is just more defensive programming, not sure if I'd seen
this failure..

The middle one did fix some hangs...

Last one is to ensure that the schedule processes more quickly and
not enforce each command to take one ms...

Before this, I was VERY frequently having to retry..  changing just
the gw improved things significantly, but changing it on both results
is no observable retries..  This is also the default that the example
apps in loramac uses..

Don't start up w/ the first four channels on...  We only want that
for the LED to let us know it's running...

This gets basic comms working and setunset working as well...  It
makes the LED blink!

This can now easily be expanded to support other projects as well..