LP1951162 Migrate copy templates setting

LP1951162 Migrate copy templates setting

Rename the user setting "webstaff.cat.copy.templates" to
"cat.copy.templates" and migrate any existing values.  This operation is
not performed for any databases where a "cat.copy.templates" user or
workstation setting type already exists.

Teach the Angular copy editor to avoid looking up templates in local
storage, since only XUL templates are stored there, which are not
compatible.

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