A bunch of classes are unnecessarily marked final

[archiecobbs]

For example, EntiyContainer, EntityQuery, EntityQueryDefinition, EntityQueryFactory, LazyQueryView, BeanQueryFactory, CompositeItem...

Why? This just makes this add-on harder to use.

[tlaukkan]

Classes are marked final because they are not designed for inheritance and to allow for later changes in the class internals without breaking a lot of depending code base. It also aims to drive the developers to extend in the designed places. However the following classes are not final anymore: LazyQueryContainer, LazyQueryDefinition, EntityQueryDefinition. The classes which are left final are either designer to not be extended at any situation or so simple that it is easier just to copy the code.