[gnome-control-center] (50 commits) Non-fast-forward update to branch wip/hadess/wacom-visibility

[Bastien Nocera <hadess src gnome org>]

The branch 'wip/hadess/wacom-visibility' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  c1be5af... wacom: Hide Wacom panel when there are no tablets
  6cf574a... wifi: Use g_debug() for a debug message

Commits added to the branch:

  770a3b1... color: Replace GObject boilerplace with G_DECLARE_TYPE (*)
  04e3695... color: Replace ifdefs with #pragma once (*)
  490bee5... color: Use g_auto for variables (*)
  5ea7632... color: Use GtkTemplate (*)
  d357f1d... region: Remove unused variable (*)
  4627e84... notifications: Remove unused variable (*)
  41d98fd... mouse: Move callbacks into .ui file (*)
  3dc77a6... mouse: Connect signal handlers swapped (*)
  f519329... power: Replace GObject boilerplace with G_DECLARE_TYPE (*)
  27a64cd... power: Replace ifdefs with #pragma once (*)
  ed6ac15... power: Simplify cancellable destruction (*)
  d2959e4... power: Simplify GPtrArray memory management (*)
  58a6432... search: Use g_auto for variables (*)
  85eeebb... universal-access: Replace GObject boilerplace with G_DECLAR (*)
  6b2ed3a... universal-access: Replace ifdefs with #pragma once (*)
  233111b... search: Use GtkTemplate (*)
  59e420b... search: Fix crash introduced in 58a6432 (*)
  0bd90ca... region: Show scrollbars if needed (*)
  930aff4... background: Fix compile warning about object type (*)
  0a47d59... Update Scottish Gaelic translation (*)
  678beb6... user-accounts: Replace GObject boilerplace with G_DECLARE_T (*)
  c461e43... user-accounts: Replace ifdefs with #pragma once (*)
  dd61d98... datetime: Move callbacks into .ui file (*)
  a64ef75... Simplify use of GCancellable (*)
  3947970... sharing: Replace GObject boilerplace with G_DECLARE_TYPE (*)
  a91ef6c... sharing: Replace ifdefs with #pragma once (*)
  42ea814... common: Replace GObject boilerplace with G_DECLARE_TYPE (*)
  223087c... common: sharing: Replace ifdefs with #pragma once (*)
  9a7850a... region: Move callbacks into .ui file (*)
  a30f660... sharing: Use g_auto for variables (*)
  3f9337d... universal-access: Use g_auto for variables (*)
  3622c8f... power: Use g_auto for variables (*)
  122f997... background: Replace deprecated GSimpleAsyncResult with GTas (*)
  a259f48... Update Catalan translation (*)
  d4a3d5a... Updated Czech translation (*)
  e072bc5... Update Russian translation (*)
  eff88ab... sharing: Use GtkTemplate (*)
  86d1d30... common: Use g_auto for variables (*)
  ca15b98... wifi: only manage Wi-Fi devices managed by NM (*)
  92f7372... Update German translation (*)
  014e572... universal-access: Use GtkTemplate (*)
  71383e8... power: Use GtkTemplate (*)
  d814d9d... Update Chinese (Taiwan) translation (*)
  c89a919... window: Remove unused panel box (*)
  baf1610... docs: Document more of the code style (*)
  a4746a9... docs: Remove trailing space from code example (*)
  9ae5f9a... Fix crash due to g_auto changes in 79e00c3 (*)
  67d39e4... region: Fix language search crash due to g_auto changes in  (*)
  2f0f24e... wacom: Hide Wacom panel when there are no tablets
  7d0e67b... wifi: Use g_debug() for a debug message

(*) This commit already existed in another branch; no separate mail sent