add portal intercept option

[cs8425]

I want players can:

1. use /mvtp to teleport between 2 or more normal world (multiverse.access.XXX & enforceaccess: 'true')
2. use home plugin for teleport to any world (teleportintercept: 'false')
3. for each normal world, vanilla nether portal for teleport to nether world, and end portal for teleport to end world

yet I can not figure out how to set that (only 1 & 2 works),
so I add a option for this.

permission & config I had used:

• multiverse.access.world1
• multiverse.access.world2
• multiverse.teleport.self.w
• multiverse.teleport.self.b
• enforceaccess: 'true'
• teleportintercept: 'false'
• portalintercept: 'false' (this PR)

[benwoo1110]

Interesting idea... will need to discuss with the rest of the devs if it's a viable option to add.