[gnome-software] (25 commits) ...Merge branch 'category-manager' into 'master'

[Philip Withnall <pwithnall src gnome org>]

Summary of changes:

  f3770ed... build: Move desktop category data into libgnomesoftware
  468480f... gs-desktop-data: Expose the number of elements in the array
  71d5659... lib: Add a GsCategoryManager
  77c6af8... plugins: Drop category enumeration from the desktop-categor
  3c14108... gs-cmd: Use GsCategoryManager to find categories for get-ca
  90c03ae... gs-overview-page: Use GsCategoryManager to get featured sub
  840c7d4... core: Drop add_category_apps() implementation from desktop-
  3cc5d5d... core: Drop desktop-categories plugin
  074f164... lib: Add menu path resolving code directly to GsApp
  09e9e40... core: Drop desktop-menu-path plugin
  d31c5a0... lib: Drop GS_PLUGIN_REFINE_FLAGS_REQUIRE_MENU_PATH
  e8a0563... gs-category: Rename icon to icon-name
  d5754f5... gs-category: Add read-only properties
  0189e8f... gs-category: Fix header includes
  7dd1ba2... gs-category: Add gs_category_new_for_desktop_data()
  d338b39... gs-category: Handle size of ‘all’ subcategory specially
  2848949... gs-category: Add desktop groups for ‘all’ subcategory autom
  0ad1b3d... gs-category: Remove unused public setter functions
  cdf82a4... gs-category: Reduce string copies by pointing to static des
  16532e5... gs-category: Lazily create desktop groups array
  c50844b... gs-category: Lazily create child categories array
  8124fbe... gs-app-row: Add cast to property enum type for switch
  d26326a... gs-plugin-loader: Remove class vfuncs for signals
  465178a... gs-plugin-loader: Make final rather than derivable
  396e480... Merge branch 'category-manager' into 'master'