Add support for base path in addition to domain

[kool79]

Often we have the same domain for many services, like:

https://my.company/jira
https://my.company/stash
https://my.company/gitlab

So will be good to match domains from DomainRegistry together with path and then use this domain/path for havigations.
Currently I can define domain in the DomainRegistry like: my.company/stash. But when I try to open commit on remote server the base path (/stash) is missed

Sure, we can configure such servers with "Custom platform" but it takes time to get know all valid settings. BTW will be good to have button like "copy from xxx" on the Add Custom Platform dialog. To be able to copy standard settings from another platforms, including standard ones: bitbucket/gitlab/etc