webstaff: new directive: egEditFmRecord

webstaff: new directive: egEditFmRecord

This implements a generic IDL record editor widget:

<eg-edit-fm-record
  idl-class            = "xyz"
  mode                 = "update"
  record-id            = "223"
  hidden-fields        = "bar,baz"
  readonly-fields      = "quux"
  required-fields      = "foo"
  is-required-override = "bundle_of_custom_functions"
  on-save              = "on_save_handler"
  on-cancel            = "on_cancel"
></eg-edit-fm-record>

The mode can be either "create" or "update"; if it is "create",
then it is not necessary or desired to pass a record-id.

Currently eg-edit-fm-record expects to be invoked from
inside a uibModal.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>