* Remove EnableEIP4881 flag
* Gaz
* Fix missing error handler
* Remove old tree and fix tests
* Gaz
* Fix build import
* Replace depositcache
* Add pendingDeposit tests
* Nishant's fix
* Fix unsafe uint64 to int
* Fix other unsafe uint64 to int
* Remove: RemovePendingDeposit
* Deprecate and remove DisableEIP4881 flag
* Check: index not greater than deposit count
* Move index check