LP1934164 egDueDate and egOrgDateInContext Angular pipes

LP1934164 egDueDate and egOrgDateInContext Angular pipes

These support displaying dates in the timezone of a specified org unit.

Example:

{{circ.xact_start() | egOrgDateInContext:circ.circ_lib():circ.duration()}}

The format service also gets a dateOnlyIntervalField parameter to
display dates as dates or dates + time depending on whether the provided
duration is day-granular.

Also adds a handy pipe (egDueDate) which takes a circulation as its
value and collects the correct parameters to display the due date in the
correct time zone and with the correct dateOnlyIntervalField value.

Example:

{{circ | egDueDate}}

Includes Sandbox examples.

Signed-off-by: Bill Erickson <berickxx@gmail.com>
Signed-off-by: Jane Sandberg <js7389@princeton.edu>