[gnome-software] (29 commits) ...Merge branch 'sidebar-part1' into 'master'

[Philip Withnall <pwithnall src gnome org>]

Summary of changes:

  f002de3... gs-overview-page: Make the class final
  3580679... src: Implement GtkScrollable on several GsPages
  81f6924... src: Remove scroll_up argument from gs_page_switch_to()
  48b7a89... gs-extras-page: Use a more specific GsShell call to change 
  ab853e3... gs-shell: Refactor mode change code to be event-based
  2d4cff2... gs-shell: Simplify some callbacks by using a GtkBuilder bin
  bee62e0... gs-shell: Simplify internal state change loop protection
  4423744... gs-shell: Simplify some page-handling logic
  5734083... gs-shell: Drop internal mode state in favour of the GtkStac
  e88bdb6... gs-shell: Use a final class instead of a derivable class
  d313522... gs-shell: Simplify gs_shell_new()
  7826668... gs-shell: Drop gs_shell_is_active()
  5abfa48... src: Use widget’s parent window rather than gs_shell_get_wi
  2f4bdce... src: Remove an unused widget from gnome-software.ui
  930151b... gs-updates-page: Fix margins and spacing across page
  c275ddc... gs-page: Add GsPage:title property
  3a6d591... gs-shell: Bind GsPage:title to application_details_header:l
  43623f4... gs-shell: Move various shell widget visibility changes out 
  b49f9d3... gs-page: Expose update/installed counter as GsPage:counter
  5f8a059... gs-updates-page: Simplify constructor slightly
  30a0312... gs-details-page: Move origin box widgets out of shell
  c2e5b56... gs-page: Don’t expose GsShell’s GtkBuilder to pages
  a228fa6... gs-shell: Port to use GTK templates
  d916503... gs-page: Simplify some constructors
  bbdf6c8... gs-shell: Remove pages hash table
  15da077... gs-shell: Move GsPage pointers into an array
  e2e9290... gs-shell: Set up signal bindings in the UI file where possi
  7efe277... Add editorconfig file
  91defb0... Merge branch 'sidebar-part1' into 'master'