Allow long zone

[chrishalcrow]

A suggestion:

Change the layout possibilities from:

+-----------------+-----------------+
| [zone1   zone2] | [zone3   zone4] |
+-----------------+-----------------+
| [zone5   zone6] | [zone7   zone8] |
+-----------------+-----------------+

to

+-----------------+-----------------+
| [zone1   zone2] | [zone3 | [zone4 |
+-----------------+        |        +
| [zone5   zone6] | zone7] | zone8] |
+-----------------+-----------------+

Mostly, this allows for a vertical waveforms view without having to use up four zones. So you're able to get layouts like this:

If you agree, I'll implement for web too!

[alejoe91]

Thanks @chrishalcrow

I wanted to do this, but never found the time. It looks great! Please go ahead and implement for panel too :)

[chrishalcrow]

Added to web - rewrote the whole web thing as it wasn't really generalising. Hoping the logic is simpler and stupid-er now.

Also added a lil section to the README, to show how to add custom layouts.