Qt Quick Controls 2 was named that way because it was a follow-up to
Qt Quick Controls 1.x. Now that Qt Quick Controls 1 is no longer
supported, we don't need to have "2" in the name. Work on this was
already started for the documentation in
1abdfe5d5a052f2298b7bf657513dfa7e0c66a56.

By doing this renaming a few weeks before feature freeze, it won't
affect the release but still results in as little time possible spent
manually fixing conflicts in cherry-picks from non-LTS releases as a
result of the renaming.

This patch does the following:

- Renames directories.
- Adapts CMakeLists.txt and other files to account for the new paths.

A follow-up patch will handle documentation.

It does not touch library names or other user-facing stuff, as that
will have to be done in Qt 7.

Task-number: QTBUG-95413
Change-Id: I170d8db19033ee71e495ff0c5c1a517a41ed7634
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

Types that use declarative registration do not need
QML_DECLARE_TYPEINFO.

Fixes: QTBUG-104837
Change-Id: I3dadc1d4f638ed2ea7ee015bc229a875929e6387
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

Replace the current license disclaimer in files by
a SPDX-License-Identifier.
Files that have to be modified by hand are modified.
License files are organized under LICENSES directory.

Pick-to: 6.4
Task-number: QTBUG-67283
Change-Id: I63563bbeb6f60f89d2c99660400dca7fab78a294
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>

Remove usages of outdated LGPL3 header that references LICENSES.LGPLv3
instead of LICENSES.LGPL3.

Change-Id: If7a90ec18331a68491c5a740f131a5e7b3f37df4
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

Adapt to the new way of registering C++ types. The types need to be
seen at compile time so that code can be generated that invokes them.

This patch:

- Adds QML_* macros where applicable.
- Adapts the build system files to the new way of registering modules.
- Splits up the QtQuick.Controls[.*].impl files into their own plugins,
  as we can only register one QML module per .pro file.
- Removes C++ type registration calls in every plugin.
- Moves private types from src/quickcontrols2/quickcontrols2.pro
  to src/quickcontrols2/impl/quickcontrols2-impl.pro. Some of these
  types need to be exposed to QML, but quickcontrols2.pro is already in
  use to declare the QtQuick.Controls import (and also provides the
  public C++ QQuickStyle API), and the new QML_IMPORT_NAME/VERSION
  syntax only allows one module per project. As some of the types that
  need to be exposed to QML are also referenced by some C++ code (e.g.
  tests, etc.), we just move all of the private types to the new
  library.

Follow-up patches will register the QML types declaratively.

Task-number: QTBUG-82922
Change-Id: Iaf9ee106237d61701d57a8896f3822304c8151a6
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

Task-number: QTBUG-82994
Change-Id: Iaf530d2a6f4dc92641d0c10e16e7b931f90646ac
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>

Now we have contentWidth and contentHeight promoted/unified to
QQuickPane and QQuickContainer, and all relevant types inherit the
properties from there. The next step is to promote read-only versions
all the way up to the QQuickControl base class.

Change-Id: Ic6ed5d7b7852b0c7faaa59b9a261c360bc63fb6a
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

[ChangeLog][Controls][SwipeView] Added contentWidth and contentHeight
properties.

Change-Id: I9c37583cb5fcfb1af2d98d5d3753277e17e82608
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

We've come to realize that even though it's tempting to group similar
properties together, organizing the API so that revisions are grouped
together makes future maintenance more pleasant. It's a lot easier to
to see what was added and when.

The same was done for earlier revisions in 5.9 in commit 430fe83.

Change-Id: I738d7fdadd348c21737228c37d0f31e39b37f8e7
Reviewed-by: J-P Nurmi <jpnurmi@qt.io>

Conflicts:
	src/quicktemplates2/qquickabstractbutton_p.h
	src/quicktemplates2/qquickbuttongroup_p.h
	src/quicktemplates2/qquickrangeslider.cpp
	src/quicktemplates2/qquickrangeslider_p.h
	src/quicktemplates2/qquickswipeview_p.h
	src/quicktemplates2/qquicktextarea.cpp
	src/quicktemplates2/qquicktextarea_p.h
	src/quicktemplates2/qquicktextfield_p.h

Change-Id: I7cba8783b1dd85a4db534222e36572ee05dd01d0