Enhance TOC in docs

[111pontes]

The table of contents (TOC) for a class documentation only includes child classes:

Given that the class attributes aren't sorted alphabetically, it is important to have a TOC that lists alphabetically both class and leaf attributes. Furthermore, it is desirable to provide three TOCs:

• TOC listing list keys in alphabetical order (only if the class specifies a list and the list has keys)
• TOC listing "Leaf Attributes" in alphabetical order
• TOC listing "Class Attributes" in alphabetical order

TOCs should have local hyper-links and not redirect to other pages.

Current structure makes it a bit cumbersome to find leaf attributes for classes with a large number of attributes.