GtkIconView support
UI widgets revison
New options: appearance/user-image-fit and appearance/list-image-fit
Hiding on login
Rewrited: 'set_background'
Merge branches 'private/rewr_background' and 'private/hide_on_login' into develop
Fixed: Up/Down selection for TreeView
Removed: unnecessary checks in 'configuration.c"
Removed: unnecessary checks, option a11y.contrast/check-theme
'*_get_state' functions replaced with 'get_state_value_*'
Removed: on_show_menu
Removed: autostart failed message dialog