Disable End Portals

Three independent options, three gamerules:

• eyeSeekStronghold - toggles if the Eye of Ender can locate the Stronghold
• endPortalFilling - toggles if the Eye of Ender can be right-clicked on a portal frame
• endPortalCollision - toggles if End Portal blocks can teleport entities

By default, all three are set to true, meaning the end is fully enabled.

Keywords: no end portal, no end access, no end dimension