Instead of throwing it all for GcalWindow to handle,
add a new class called GcalQuickAddPopover that handles
event creation.
Events are always all day when created from the quick
add popover, unless the user wants to change it and click
'Edit Details' button.
In the future, we'll look forward adding natural language
support, so the user can type the times directly from the
entry (like e.g. "soccer at park from 10am to 11:30am").
Lapo Calamandrei