Factions: Ship Engine Permissions

[Repinuj]

Allow Leaders to set permissions to allow lower ranks to purchase or revoke ship engines/boosters/anchors. Just like with most faction purchases.

Currently, anyone who can set a stronghold can steer the ship. But only leaders can actually purchase or revoke the engines which make it possible. Given the cost of running engines, buying and revoking engines is pretty much part of steering. Not even the biggest factions can afford engines up when stationary.

Alternately, just merge ship movement purchases into the stronghold setting/revoking permission.

[Kandarin]

Promote. The only reason this didn't happen already is because adding it before the breath launch (i.e. sequestering two different versions of the permissions page, one with it and one without) would have been extremely painful to code.