Add option to skip mimic build in dev_setup.sh
Add option to skip mimic build in dev_setup.sh

Add a -sm "Skip mimic" option to dev_setup.sh which
will always prevent the download and complile of
the original Mimic.  By default, we still want to
do this all the time, but there are situations where
it is convenient to skip this time-consuming step.

forslund/mycroft-core,Dark5ide/mycroft-core,linuxipho/mycroft-core,forslund/mycroft-core,MycroftAI/mycroft-core,linuxipho/mycroft-core,Dark5ide/mycroft-core,MycroftAI/mycroft-core