Core: Ability to override storage path is non func

[luceos]

I'm trying to hook Flarum into flagrow.io by running a custom skeleton.

I noticed that when $storagePath is set on the (Un)InstalledSite it will be used to enforce into laravel. However, the property is private and only InstalledSite has a setStoragePath() method; UninstalledSite does not. Also as the instantiation happens from Site, there might need to be a way to forward the property/setting into the created classes.

Flarum version is upcoming beta 8.

[franzliedke]

There you go. :kissing_heart:

Please note that the flarum/flarum skeleton needs to be updated just a little bit, too.

[luceos]

@franzliedke love the change! Thanks!