Use coloured icons for task status

[argilo]

When using ka9q-radio, the "Tasking" section takes up a lot of space:

Here I'm experimenting with a more compact display, with a circle representing each receiver:

• 🔵 = scanning
• 🟢 = receiving
• ⚪ = idle

Hovering over a circle shows the details in a tooltip:

Or click on the tasking section to display a list of all tasks:

[argilo]

This seems to work well for my ka9q-radio setup. The only thing I don't like is that for single-channel setups (which will be much more common), the receiver status is hidden away even though it wouldn't take much space. Perhaps we could skip the drop-down list and display the status on the right when there's only a single channel.

[argilo]

I made a couple improvements, and I'm now happy with how it looks.

When there are three tasks or fewer, the full list is always displayed:

When there are more than three tasks, a summary is displayed, and clicking on it reveals the full list: