Removed the Teleport to spawn functionality because it was annoying me
Updated Tiers with blocks added since 1.5
Made PersistentRune.disabled a class field and switched RuneTimer to check for disabling.  PhantomTorch and ZeerixChest now have limited uses.  There's still an issue with Zombie runes.
MAJOR: Consolidated all the PersistRune execute functions into a single execute() that searches for duplicates, builds a new rune if neccessary, then notifies the rune it has been poked.