examples: Make qmlextensionplugins example usable without installation

The qmldir file as well as the .qml files have to be placed next to the
plugin, the import path has to be added to the .qmlproject, we want the
.qmltypes file added to the same place, and the plugins.qml should also
be available in the destination directory.

Change-Id: I82b369693e612779c6213345cc8f6a30b16d41b4
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

examples/qml/qmlextensionplugins/plugins.qmlproject

@@ -13,4 +13,6 @@ Project {
     ImageFiles {
         directory: "."
     }
+
+    importPaths: [ "imports" ]
 }

examples/qml/qmlextensionplugins/qmlextensionplugins.pro

@@ -7,6 +7,7 @@ QML_IMPORT_MAJOR_VERSION = 1
 
 DESTDIR = imports/$$QML_IMPORT_NAME
 TARGET  = qmlqtimeexampleplugin
+QMLTYPES_FILENAME = $$DESTDIR/plugins.qmltypes
 
 SOURCES += \
     plugin.cpp \
@@ -23,14 +24,22 @@ PLUGINFILES = \
     imports/$$QML_IMPORT_NAME/hour.png \
     imports/$$QML_IMPORT_NAME/minute.png
 
-pluginfiles.files += $$PLUGINFILES
+target.path = $$[QT_INSTALL_EXAMPLES]/qml/qmlextensionplugins/imports/$$QML_IMPORT_NAME
 
-qml.files = plugins.qml
-qml.path += $$[QT_INSTALL_EXAMPLES]/qml/qmlextensionplugins
-target.path += $$[QT_INSTALL_EXAMPLES]/qml/qmlextensionplugins/imports/$$QML_IMPORT_NAME
-pluginfiles.path += $$[QT_INSTALL_EXAMPLES]/qml/qmlextensionplugins/imports/$$QML_IMPORT_NAME
+pluginfiles_copy.files = $$PLUGINFILES
+pluginfiles_copy.path = $$DESTDIR
 
-INSTALLS += target qml pluginfiles
+pluginfiles_install.files = $$PLUGINFILES $$OUT_PWD/$$DESTDIR/plugins.qmltypes
+pluginfiles_install.path = $$[QT_INSTALL_EXAMPLES]/qml/qmlextensionplugins/imports/$$QML_IMPORT_NAME
+
+qml_copy.files = plugins.qml plugins.qmlproject
+qml_copy.path = $$OUT_PWD
+
+qml_install.files = plugins.qml plugins.qmlproject
+qml_install.path = $$[QT_INSTALL_EXAMPLES]/qml/qmlextensionplugins
+
+INSTALLS += target qml_install pluginfiles_install
+COPIES += qml_copy pluginfiles_copy
 
 OTHER_FILES += $$PLUGINFILES plugins.qml