Remove Deferred Transactions

[ericpassmore]

Deferred Transactions have been deprecated for some time. This issues outlines the work needed to removed deferred transactions from the code.

Investigation Tasks

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1. DTrx: Review system contracts for deferred transaction
2. DTrx: Document solutions or alternative to deferred transactions found in EOS system contracts

Removal Tasks

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1. DTrx: Remove deferred trxs configuration #1556
   👍 lgtm +1
   
2. DTrx: Protocol Feature removing deferred transactions #1555
   👍 lgtm +1
   
3. Remove dependence on deferred transactions in reference contracts reference-contracts#8
   👍 lgtm +1
   
4. DTrx: Remove dependence on deferred transactions in EOS System Contracts
5. DTrx: Update tests

[BenjaminGormanPMP]

Closed per completion of assigned GitHub issues by @linh2931.