Add copy url

[niladam]

Adds the copy functionality.

The workflow that exists in this repo, also allows for a modifier key (shift) to enable a secondary action that allows the copy of the selected (from the list) tab's URL directly to the clipboard.

This also addresses #2 :)

[niladam]

@bit2pixel - i just realised i didn't sync my fork before working on this. Basically, the only lines you'd need are in chrome.js#L189-L203 and adding the modifiers again (i'm currently using the setup like in the screenshots below)

The copy function is pretty simple, and all i did was inspire myself from your code. Figure i'd just give a hand :)

You can clearly close this PR and just attach the copy function and the flow to the workflow yourself, -- tagging a new release maybe so that i can pull it in too ?:)

[niladam]

hi @bit2pixel - i realise you must be busy but have you had the chance to look at this ?