Add http(s):// URI handler

[RootLUG]

Add a generic http(s) URI handler that would download the URL and scan the target.
This should support also the following rewrites for other types of URIs:
https link pointing to pypi should be re-written to pypi:// or handled by that URI handler
https link pointing to github or gitlab (without .git) should be rewritten to be handled by git:// handler