Replace Radioplayer button with an in-page player

[ashhhleyyy]

The URY Player(tm)

[ashhhleyyy]

Things still to do:

• Show current time from playback (including the 15s online delay)
• Scrubbing support through the local buffer
• Close button
• Make send message form not refresh the page

Update: removed scrubbing support from this initial version

[ashhhleyyy]

Just needs some fixup on the mobile CSS (or alternatively, just use radioplayer on mobile)

[ashhhleyyy]

Here's what the final thing looks like:

And on mobile:

[alyxbb]

is the send message updates a duplicate of #292?

[ashhhleyyy]

rebased onto development to fix merge conflicts

[ColinRoitt]

Made a few changes, @ashhhleyyy would you check you're happy with these then and we can count that as reviewing both ways

[ashhhleyyy]

need to make a couple tweaks then this should probably be good to go

[ashhhleyyy]

oops

[ashhhleyyy]

• show more button on the current and next
• webcam somewhere
• better contrast on close button