New Tab from Location Bar per Piro (piro_or)

NOTE: This project seems needless on Firefox 60 and later. You just go to `about:config` and turn `browser.urlbar.openintab` to `true`.
See also the bug 1394304 - Support always open urlbar result in a new tab.

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Opens new tabs from the location bar, by conditions. This provides only following features:

* Always open new tab by any operation in the location bar.
* Open new tab as a "child" of the current tab if the URI is a part of the website you are browsing in the current tab.