Per-portal barrier blocks #59
Description
Is your feature request related to a problem? Please describe.
Not really a problem, just something to let you do more things w/ the plugin.
Describe the solution you'd like
The ability to set the border blocks used for when the view of other side of a portal is cut off, ie. /nv barrier portalName blockName
Describe alternatives you've considered
Currently we just have the same border block for all portals via config file
Additional context
Would allow things like a fairly seamless infinite hallway.