EOS Fees upgrade

[DenisCarriere]

Change Description

Deployment Changes

• [x] deployment of eosio system contract
• [x] must create eosio.fees new account
  • contract deployment optional

API Changes

• [x] new ACTION donatetorex
• [x] new ACTION buyramburn
• [x] new ACTION logsystemfee
• [x] Include fee field to action return STRUCT & logging ACTION
  • [x] update STRUCT to include fee
  • [x] action_return_buyram
  • [x] action_return_sellram
  • [x] update ACTION to include fee
  • [x] logbuyram
  • [x] logsellram
• [x] exposes the following public STATIC methods:
  • [x] rex_system_initialized() => bool
  • [x] rex_available() => bool
  • [x] get_core_symbol() => symbol

Economic Changes

• [x] Channel system fees to eosio.fees
  • [x] REX fees directed to eosio.fees
  • [x] RAM fees directed to eosio.fees
  • [x] PowerUp fees directed to eosio.fees
  • [x] Name bids fees directed to eosio.fees

Documentation Additions

• https://github.com/eosnetworkfoundation/eos-system-contracts/issues/118
• https://github.com/eosnetworkfoundation/eos-system-contracts/issues/121
• https://github.com/eosnetworkfoundation/eos-system-contracts/issues/119
• https://github.com/eosnetworkfoundation/eos-system-contracts/issues/122
• https://github.com/eosnetworkfoundation/eos-system-contracts/issues/123
• https://github.com/eosnetworkfoundation/eos-system-contracts/issues/130