LP1891550 Ang print context support; no-print contexts

LP1891550 Ang print context support; no-print contexts

Adds support to the Angular server template admin page for forcing a
print context for a given template.

Adds support to the Angular print service for looking up the context of
a print template when specified by name.

Adds support to And and AngJS print settings interfaces for a "No-Print"
context, which bypasses printing when used.

Adds a new workstation setting for the Booking Capture server print
template context.

Signed-off-by: Bill Erickson <berickxx@gmail.com>