Perform action on episodes

[mfietz]

Something to play with. Not very well tested yet.

Something to look at:

[TomHennen]

Will this wind up taking the place of #945?

• Doesn't actually add the episodes in the order displayed. I think this is because 'episodes' is what gets sorted. But checkedIds isn't. If I clear all checked, sort, check all, then add it works correctly.
• If people like this it could be added to All and New Episodes (though we might want to hold off on that)
• It's bit of a complicated user interface, but I don't see how to make it simpler and handle everything requested.

[mfietz]

Order should now be correct. Also several optimizations.

I guess this looks complicated because it is new and there is no UI like it yet. Shouldn't take long for people to figure out how this thing works.
We could add tooltips with the supertooltips library, but that would look rather childish to me. Either we let the users explore the UI or we have some explanatory image on first usage that explains some of the UI elements (e.g. that those two arrows are for sorting...)

[TomHennen]

I don't think tooltips are needed.

I did run in to something strange with the coloring of the checkboxes. I unchecked one, they all turned grey, then as I scrolled, this happened:

[TomHennen]

This will break for feeds that have items without media.

[TomHennen]

Otherwise, looks good.

[mfietz]

Everything fixed, except for the "I forgot how to checkbox" glitch