Due to the fact that getComputedValue is called when using filter and
opacity attributes, it is much more efficient to use an SVG that has a
changing fill color rather than something that may be interpreted by
browsers as a layout change that requires layout recalculation.
This should result in noticeably smoother and more responsive :hover
events for the streams with greyed checkmarks.
This adds styling such that when you hover over a stream in the streams
list and you are not subscribed, you will see a faint grey checkmark
that serves as a target of where to click so you can subscribe to a
stream.
There is a case with browser zoom that the inline-block split view
breaks down and the two 50% tabs fall below each other. This prevents
that issue from happening.
This is a major change to the /#subscriptions page, converting it to
by a side-by-side list of streams and their settings in an overlay.
There are no new features added/removed, but it's a huge changeset,
because it replaces the old navigation logic and moves the stream
creation modal to appear in the right side of this overlay.