feat: web support http basic authorization

[monkeyWie]

related: #146 #128 #117

[monkeyWie]

通过命令行参数开启身份认证：

./gopeed -u gopeed -p xxx

或者通过指定配置文件启动：

./gopeed -c config.json

• config.json

{
  "address":"127.0.0.1",
  "port":8888,
  "username": "gopeed",
  "password": "xxx"
}

输入-h参数查看更多参数说明：

./gopeed -h
Usage of C:\Users\liwei\Downloads\gopeed-web-v1.3.8-windows-amd64\gopeed.exe:
  -A string
        Bind Address (default "0.0.0.0")
  -P int
        Bind Port (default 9999)
  -T string
        API token, that can only be used when basic authentication is enabled.
  -c string
        Config file path (default "./config.json")
  -p string
        HTTP Basic Auth Password
  -u string
        HTTP Basic Auth Username (default "gopeed")

同理通过docker启动时也可以加上命令行参数开启身份认证：

docker run -d -p 9999:9999 -v /path/to/download:/root/Downloads liwei2633/gopeed -u gopeed -p xxx