URL decoding for username and path

URL decoding for username and path

* Support git remotes that use an url with a user name that is URL encoded.
* Fix git-lfs special remote ssh endpoint discovery when the repository
  path is URL encoded.

In the previous commit, Git.Url.host was made to do URL decoding. That made
me wonder, what about URL encoded username and path? And so to these two
additional fixes. Note that Git.Url.authority remains URL encoded. That
seems ok given how it's used.