gtkmountoperation: Add TCRYPT options to the ask-password dialog

Add widgets to the GTK ask-password dialog to allow the user specifying the TCRYPT options now supported in glib.

This requires glib version 2.57.2.

Commit 5d68dab0 improves the appearance of the ask-password dialog to go better with the new widgets.

Corresponding gtk 3.24 merge request: !262 (merged)

Merge request reports