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", so we'd need "8x" for retina. Alternatively I can reduce the icon sizes by 50%.
  - The "Help", "Settings" and "Logout" items currently have a "glowing" hover state, which needs a variant (or we can drop it).
  - The /applications/ icons have a white hover state (or we can drop it).
  - The 1x application (14x14) icons aren't used anywhere right now, should they be? Maybe in the feed in the future, etc?
  - The "apps-2x" and "apps-large" sheets are the same image, but getting them to actually use the same file is a bit tricky, so I just left them separate for now.

Test Plan:
{F26698}
{F26699}

Reviewers: chad

Reviewed By: chad

CC: aran

Maniphest Tasks: T1960

Differential Revision: https://secure.phabricator.com/D4108

webroot/rsrc/css/application/base/main-menu-view.css

@@ -341,12 +341,12 @@ a:hover .phabricator-main-search-typeahead-result .result-type {
 .phabricator-core-menu-icon {
   position: absolute;
   display: block;
-  width: 26px;
-  height: 26px;
+  width: 28px;
+  height: 28px;
 }
 
 .phabricator-core-menu-profile-image {
-  background-size: 26px 26px;
+  background-size: 28px 28px;
 }
 
 .device .phabricator-core-menu {

webroot/rsrc/css/application/base/phabricator-application-launch-view.css

@@ -68,8 +68,8 @@ a.phabricator-application-launch-container:hover {
   position: absolute;
   left: 15px;
   top: 10px;
-  width: 60px;
-  height: 60px;
+  width: 56px;
+  height: 56px;
   background-repeat: no-repeat;
 }