…Ps#160 (#175)

This change will allow to designate a space template super administrator
in replacement to the previous Spaces Administrators concept, which
wasn't related to the used Space Template to create the space.

…r - MEED-7771 - Meeds-io/MIPs#160 (#176)

This change will allow for a space master to choose a space which is
managed/mastered (switch space template configuration) when configuring
a poll event in a rule.