Setting to change port number

[trymeouteh]

Is your feature request related to a problem? Please describe.
A setting to change the port number for seeding LBRY content.

Describe the solution you'd like
In the settings, to have a setting the change the port number.

Describe alternatives you've considered
None

Additional context
Some people are limited on what ports they can use. In the case of users who use a VPN with a port forwarding feature you cannot choose what ports to use. LBRY by default uses port 3333, please allow this to be change to any number in the settings to allow more users to be able to seed LBRY content to help keep the network strong.