Flatten and rename example install path and directory structure

Change-Id: Ib04e79d72c37fa4507517da2d3b1c28ccd73eaed
Reviewed-by: J-P Nurmi <jpnurmi@qt.io>
Reviewed-by: Venugopal Shivashankar <venugopal.shivashankar@digia.com>
Reviewed-by: Topi Reiniö <topi.reinio@theqtcompany.com>

examples/examples.pro

@@ -1,3 +1,3 @@
 TEMPLATE = subdirs
 SUBDIRS += \
-    controls
+    quickcontrols2

examples/quickcontrols2/gallery/gallery.pro

@@ -11,5 +11,5 @@ OTHER_FILES += \
 RESOURCES += \
     gallery.qrc
 
-target.path = $$[QT_INSTALL_EXAMPLES]/qtlabscontrols/gallery
+target.path = $$[QT_INSTALL_EXAMPLES]/quickcontrols2/gallery
 INSTALLS += target

src/imports/controls/doc/qtlabscontrols.qdocconf

@@ -28,14 +28,14 @@ depends = qtcore qtgui qtdoc qtqml qtquick qtquicklayouts qtquickdialogs qtquick
 # Specify the install path under QT_INSTALL_EXAMPLES
 # Note: paths passed to \example command must contain the parent directory, e.g.
 # \example controls/tabs
-exampledirs += ../../../../examples/controls \
+exampledirs += ../../../../examples/quickcontrols2 \
                ../ \
                ../../../templates \
                ../../calendar \
                ../../../../tests/auto/controls/data \
                snippets
 
-examplesinstallpath = qtquickcontrols2/controls
+examplesinstallpath = qtquickcontrols2/quickcontrols2
 
 headerdirs += ../../../templates \
               ../../calendar \