merge into (#113)

* rebase main branch code

* rebase main branch code

* rebase main branch code

* add testcase and updatesome code

* add comments

* rebase main branch code

* update genesis

* update btc contract and test case

* add testcase

* update testcase

* rebase to main branch

* rebase main branch and refactor with consensus logic

* add test case

* update testcase

* remove unnecessary delegator/withdrawer parameters on exocoregateway contract

* rename btcTxHash to btcTxTag

* update event

* update test script

* update some types from bytes32 to bytes

* update event type

* optimize the test script

* add read pegoutrequests and setStatus interface for withdraw request

* fix unit test error

* fix unit test error

* remove console log

* add comment for the storage code

* optimize some logic for btc-gateway

* update comment (#5)

* formate code

.gitignore

@@ -23,3 +23,4 @@ node_modules
 .idea
 
 .gas-snapshot
+yarn-error.log