Signed-off-by: Justin Chadwell <me@jedevc.com>

This patch reorders+refactors the runCreate function to ensure that we
can detect and notify the user in the scenario that the user attempts to
combine multiple drivers in a single builder, which is an unsupported
scenario.

Previously, we would just overwrite the previous builder with the new
driver, potentially invalidating the already existing nodes.

Signed-off-by: Justin Chadwell <me@jedevc.com>

Previously, editing nodes to contain a new set of driver options or
config files was unsupported, and silently dropping them. In this patch,
we update with these, as well as add a new warning message that any new
options may not taken into account until the builder restarts (which
may apply to the flags, platforms and endpoints as well).

Signed-off-by: Justin Chadwell <me@jedevc.com>