Add ability to change between http and https endpoints

[axw-pub]

Describe the bug
Script repositories are hard coded to http and don't support https calls on port 443.

To Reproduce
Steps to reproduce the behavior:

1. configure a stash or xbvr repository with ip or hostname and port 443

[Yoooi0]

I dont think #151 is a correct fix as it hardcodes 443 as https port.
The EndPointBox should be converted to UriBox or something like that with ability to specify the scheme and path.
I'll try to implement it today but I have to also release 1.28/1.27.1

[axw-pub]

Yes, it only solves the most common case. Adding a protocol drop down to the settings UI will be better, of course. I can use port 80 with a 301 redirect for now, which works fine.

[Yoooi0]

Pushed, UriBox probably needs some styling improvements tho.
Let me know if find any issues.