The algorithm was designed so All portals must be facing the center, no matter which block had the eye inserted in last.
Note: Still need to create a block entity so that portals don't become invisible when you relog.
Addresses part of #3445Fixes#3695
Adds a block handler for concrete powder and implements hardening to concrete.
Concrete powder turns into concrete when:
* It is next to water when it receives a block update
* It falls onto a water block (even with Physics SandInstantFall=1)
Zach DeCookandpeterbell10
