refactor!: add top level commands and new sub commands (#70)

* feat: new top level subcommands

* setup top level subcommands and children
* update docs
* update flags and args

* feat: change qbit client pkg

* docs: update example config

* feat(categories): list

* feat(categories): add

* feat(categories): delete

* feat(categories): edit

* feat(tags): list add delete

* feat(torrent): category set unset

* feat(app): get qbit version info

* chore(deps): update go-qbittorrent to v1.4.0

* docs: update README

.qbt.toml.example

@@ -1,8 +1,9 @@
 [qbittorrent]
-host     = "127.0.0.1" # qbittorrent webui-api hostname/ip
-port     = 6776        # qbittorrent webui-api port
-login    = "user"      # qbittorrent webui-api user
-password = "password"  # qbittorrent webui-api password
+addr       = "http://127.0.0.1:6776" # qbittorrent webui-api hostname/ip
+login      = "user"                  # qbittorrent webui-api user (optional)
+password   = "password"              # qbittorrent webui-api password (optional)
+#basicUser = "user"                  # qbittorrent webui-api basic auth user (optional)
+#basicPass = "password"              # qbittorrent webui-api basic auth password (optional)
 
 # some trackers are bugged and need to reannounce before torrent can start
 [reannounce]