First version of search-based ID browsing. Now only in use for the top bar screen/scene browse. The python buttons will follow. Also made search button colors match the theme colors from menu back. Todos for browse-search: - "Add new" will disappear, and become a separate icon button in the row of widgets (like X, delete). - Drawing the preview icons in menu - Make search menu dynamic, with configurable number of items? And/or multi-collumn... for now it's static - Search menu should popup with last active ID visible and selected