Cleanup ImplicitClone related stuff in the examples

[cecton]

Description

What does this PR do?

1. Use more cheap-to-clone types in the examples
2. Some examples got impacted by #3453 (the removal of ToHtml), I fixed them so we can use reference where it makes sense (I added a few IntoPropValue on cheap-to-clone types)
3. Updated implicit-clone to the latest version
4. Optimized ChildrenRenderer memory allocations by using Rc

Changes did on the side:

1. In order to get some example working, I had to change NodeSeq to use IArray. This is good because it is more optimized for memory allocations too
2. Slightly improve the API of VChild to easily get a ref mut inside its properties object (just for convenience!)

Related to #3453

Checklist

• [x] I have reviewed my own code
• [x] I have added tests