First post always editable

[smartpunter]

Sometimes topics has short summary and updates in first post, so they need to be edited frequently, while other content on forum should not be edited after certain time.

Please add a setting "Always allow to edit first post in topic", i shouldn't be difficult and will come very handy in certain use cases.

[Kosiak]

@smartpunter
https://community.nodebb.org/topic/13490/bounty-of-500-wiki-plugin/

[smartpunter]

This is completely different and much more complex request.
To achieve functionality I am askin gfor, they have just add a new settings for 'always be able to edit first post' and when checking, if user is allowed to edit post skip checks of 'time, while allowed to edit' setting.

No need to add wiki functionality, just a small tune for posts editing time settings, which are already in core.