* go style commands
merge v2ctl commandsw
* migrate go style commands to v2ctl
* fixes & code optimize
* sort the commands
* update commands description
* restore old proto
golang.org proto has removed UnmarshalText, without alternative
* add test command
* remove unused code
* code optimize and fix
* The commit simplifies the run and test commands code,
* Fixes a hidden issue that the format flag not applied in command "v2ray test -format=pb ..."
* fix default loader logic
