Bookmarks should store table filters

From directus created by jroxendal : directus/directus#2093

Version Info

• Directus version and branch (Or commit hash): https://github.com/directus/directus/commit/62eb6d15818c7e021b836d3ad8c6f1f014210101
• PHP version: 5.6.23
• MySQL version: mysql Ver 15.1 Distrib 10.0.23-MariaDB
• Web server: (Ex. Apache, nginx or IIS?) Apache
• OS name and version: some linux server

Expected Behavior

When viewing a table and selecting a filter (over, say, unpublished items that require editing), that filter is not encoded in the location bar. Thus, when creating a bookmark, the filter is not included.

Actual Behavior

The filter seems tied to the table by some other means (session? user account?). It is not bookmarkable.

The behavior I would prefer is that of a Smart Playlist in iTunes or Smart Folder in Finder, which show an ever changing list of items that conform to some constraint (e.g. <tag is 'work' and filetype is 'pdf' and filename contains 'bookkeeping'>). Having filters bookmarkable would bring such functionality to Directus.