Restore.
Merge branch 'master' of https://github.com/qreal/qreal into metamodelingOnFly

Conflicts:
	qrgui/pluginManager/editorManager.h
	qrgui/pluginManager/interpreterEditorManager.h
	qrgui/pluginManager/proxyEditorManager.h
	qrgui/qrgui_ru.qm
	qrgui/qrgui_ru.ts
	qrgui/view/private/exploserView.cpp
	qrgui/view/private/exploserView.h
Hidden properties removing.
fixed metamodel opening.
Restore renamed or removed properties.
Merge branch 'master' of https://github.com/qreal/qreal into metamodelingOnFly

Conflicts:
	qrgui/qrgui_ru.qm
	qrgui/qrgui_ru.ts
minor corrections