Add a cmake check to ensure the simulator is new enough and guide
users to update it and rebuild if it isn't,
so they get a better experience than by just getting a build or
runtime error.
Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>
For developers ease, let's try to find the simulator
thru west if the environment variables that tell where
the simulator is are not set.
Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>