Move tab(s) to window #4

Currently we can move a group of tabs to the right, but what if we already have a window open that we want to move them to? For a single tab we can easily drag it over.. but less so if we have multiple tabs.

Proposed features:

• Move this tab to window
• Move this tab + 'to the right' to window
• Move 'to the right' to window
• Move this + 'to the left' to window
• Move 'to the left' to window

To keep the UI 'clean', we should probably include an options page (see #5) that allows this (and other future things) to be disabled if/as the user desires. This could be at the feature level (eg. this whole thing), as well as at the sub-feature level (eg. if I never want to do things with tabs 'to the left', i could hide those options)

APIs:

• https://developers.chrome.com/extensions/windows#method-getAll