JSON-based folders rendering
Dedicated commands for back, forward, parent
Proper history implementation
Bugfix: properly scroll to selected after initial run
Better initial selection when no images in folder; Fix image div size rounding issue.
Minor fix in browse: add .selectable to selector when key-navigating
Remove get_name file-related logic from JS, title included as crumbs in the folder info json
Add 'Next sibling' category
Added bookmarks support. Fixes to show usage.
Add spinner support, minor changes.
Proper url and html escaping in browse
Convert paths to URLs and back at Python level, not in JS
overflow-x: hidden for the browser