Add AvatarSelector
This implements an AvatarSelector widget and a CropArea widget.
Images can be loaded via drag and drop or an external 'Select Picture' button > FileChooser > path. The crop frame can be moved and resized.
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get_avatar_surface
yields a surface for use within Gajim -
get_avatar_bytes
yields bytes ready for publishing
Original code of the CropArea widget was ported from GNOME’s Cheese application um-crop-area.c.
Edited by Philipp Hörist