Class list sidebar

[kiith-sa]

Add a right-hand sidebar listing classes below that functions, below that vars, and so on. Each "section" e.g. classes, should be separated into a local part (nested classes, methods, properties of the class/struct owning currently viewed item) and a global part (global classes/functions/etc).

Alternatively, there could be two big Local and Global parts, each separated into sections by type of symbol.

For classes, the sidebar should show parent/child relationship (like the TOC tree).

• The sidebar must be optional (on by default) through hmod.cfg
• The sidebar must be hideable if JavaScript is enabled (or use CSS for this if possible)
• If JS is enabled, the sidebar should have a filter input on the top (like e.g. the Dolphin file manager)

[kiith-sa]

Depends on #37.