[DEV] Added new state for the RollingSpider
[DEV] Added new state for the RollingSpider

Added init state which means that the rolling is initializing
When the RS is in this state, user should let the drone steady
for a while

Change-Id: I6146b0735c92cb3241b57359306c200cc6c804c6
Reviewed-on: https://gerrit.parrot.biz/18065
Reviewed-by: Nicolas Brulez <c7b4d7ddc34318e865922d5ddc9ce680dfb1b14c@parrot.com>

Parrot-Developers/libARCommands,Parrot-Developers/libARCommands,Parrot-Developers/libARCommands