Fails to connect to IPv6 addresses directly

[TrueTechy]

Describe the bug
Addon cannot connect to server if given address is an IPv6 address

To Reproduce

1. Enter ::1 in host section
2. Click connect

Expected behavior
Addon connects to server

Logs
InvalidURL: Failed to parse: http://::1:9898/emby/system/info/public

System (please complete the following information):

• OS: Ubuntu
• Jellyfin Version: 10.4
• Kodi Version: 18.3
• Addon Version: 0.2.1

Additional context
Seem to be due to the request not properly encapsulating the IPv6 address since it has a port on it as well. Should be enclosed by square brackets https://softwareengineering.stackexchange.com/questions/311413/how-should-we-represent-an-ipv6-address-with-port-number-in-text

[TrueTechy]

#94 seems to make the add-on crash when adding an IPv6 address, I assume because it's expecting a domain name. It may also not like v4 addresses haven't tested those

[oddstr13]

Please test #103, it should solve this issue