Coming Episodes Overhaul

Change Coming Episodes to "Episodes" page (API endpoint is not renamed).
Change Layout term "Calender" to "Day by Day" on Episodes page.
Fix saving of sort modes to config file on Episodes page.
Add qTip episode plots to "Day by Day" on Episodes page.
Add article sorting to networks on Episodes page.
Add toggle sort direction and multidimensional sort to isotope on Episodes page.
Simplified sort code in webserver and in template.
Add other UI tweaks.