Fixed /warp update permission
Added missing translation for flag-errors
Fixed /warp create permission
Added an abstract class for classes that only store values assigned via
permissions (limits, cooldowns, warmups...)
Fixed limit checks on /warp public and /warp private
Added economy support via Vault. Needs more testing.
Support for warp signs is currently not implemented as it needs some
refactoring on the warp signs side.
Added optional message that informs about the withdrawn amount