Merge Extras' styling system into Controls'.

- Removes the duplicated style settings functionality in Extras and
  simplifies the installed styles directory structure.

- Extras' Base style is now part of Controls' Base style, eliminating
  the need for a separate QtQuick.Extras.Styles import. The cost of
  doing this should be negligible: a few QML files and two images.

  If we didn't merge Extras' Baste style into Controls', we'd need
  extras-specific code in qquickcontrolssettings, as the default style
  search path is:

  qml/QtQuick/Controls/Styles/

  Whereas the Extras Base style would be in:

  qml/QtQuick/Extras/Styles/

  The Extras Base style can't go into Controls' Base style directory,
  either, because otherwise we'd have two qmldir files there.

  The Flat style doesn't have this problem because it is all contained
  in one plugin and gets installed into its own Flat/ folder.

- Documentation now lists the Extras controls as \since QtQuick.Extras
  1.4.

- Adds the customcontrolsstyle auto test to ensure that custom styling
  is tested.

Change-Id: I19ca7a8b7e1c1daa85b272f4ccf9a2f05c76e0d9
Reviewed-by: Caroline Chao <caroline.chao@theqtcompany.com>
Reviewed-by: J-P Nurmi <jpnurmi@theqtcompany.com>

1 files changed, 0 insertions, 0 deletions

diff --git a/src/controls/doc/images/circulargauge-needle-example-2.png b/src/controls/doc/images/circulargauge-needle-example-2.png
new file mode 100644
index 00000000..a2b5f322
--- /dev/null
+++ b/src/controls/doc/images/circulargauge-needle-example-2.png