Move and rename server classes which go into the compatibility package
* Use com.vaadin.v7
* Use the same class name as in Vaadin 7
* Use a "vaadin7-" declarative prefix for Vaadin 7 components
Change-Id: I19a27f3835b18980b91a4f8f9464b2adde1a5fd5
Support static inner classes when reading/writing declarative files (#20038)
Uses outer class name as package name for static inner classes. When reading,
there is no way to know that the class is an inner class so only when creating
a class fails, an inner class is tried as a backup.
Change-Id: I3ebf5b2da11384f9dc64072a3dc8ee132607237c