* gct: phase one context awareness pass
* exchanges: context propagation pass
* common/requester: force context requirement
* gctcli/exchanges: linter fix
* rpcserver: fix test using dummy rpc server
* backtester: fix comments
* grpc: add correct cancel and timeout for commands
* rpcserver_test: add comment on dummy server
* common: deprecated SendHTTPGetRequest
* linter: fix
* linter: turn on no context check
* apichecker: fix context linter issue
* binance: use param context
* common: remove checks as this gets executed before main
* common: change mutex to RW as clients can be used by multiple go routines.
* common: remove init and JIT default client. Unexport global variables and add protection.
* common: Add comments
* bithumb: after dinner mints fix
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