Conditionally load FullCalendar Javascript files only on specific pages where they're needed

[carrythebanner]

Currently:

• Calendar CSS and Javascript are only loaded on calendar pages (e.g. not on the About page)
• Which calendar CSS is loaded is determined by page type (e.g. we only load grid styles on pages that display the calendar grid)
• However, we still load all calendar Javascript on any calendar page, including when it's not used

The FullCalendar JS files are are some of the weightier JS, so if we don't load those on the regular /calendar or /addevent pages we could save a decent chunk of bandwidth.