Enable renaming of strongholds

[Eraamion]

It would be a nice touch of customization to let stronghold owners rename the strongholds so instead of the generic text at the entrance the placeable would display the current name defined by the owner.
This can also extend to the related placeables and the IG noticeboard system, e.g. the noticeboards around the Ticker square tied to the respective strongholds would be also renamed, making it clear that they display items related to that particular stronghold/faction.