R1:f306cab653d8

Use application icons for "Eye" menu and Crumbs

Summary:
Issues here:

- Need an application-sized "eye", or a "home" icon for "Phabricator Home".
- Some of the "apps_lb_2x" sliced images are the "_dark_" versions, not the light versions.
- If you slice an application-sized "logout" (power off) icon and application-sized "help" (questionmark in circle) icon I can replace the current menu icons and nearly get rid of "autosprite".
- To replace the icons on /applications/, the non-retina size is "4x"…