Again, use classname instead of ID for styling.

Also Docs.Favorites no more calls for some global treePanel component,
but is instead given the TreePanel it should use.

No more access ClassOverview by ID. Instead it just has a classname
which is also used for styling in CSS.

The tab panel no more uses an ID.

Created separate store for Docs app settings to remember that.

Allows to avoid duplication of doc-comments when one class aliases
methods from other class.

Solves the problem of --append-html not being correctly escaped.

Might be better to have a separate section for static methods, but
for now it's better than nothing at all.

When using Ext.define and not having {extend: "SomeClass"} or
@extend SomeClass, then automatically assuming that we're extending
Ext.Base.

Visually marking them as protected with label similar to deprecated.

For History/Favorites it replaces the MenuButton, which duplicated
a lot of functionality in HoverMenuButton.

I didn't know that an additional event options object gets passed
to each event handler.

Now we have all our dependencies loaded dynamically.

HoverMenu is now used by both MenuButton (Favorites, History) and
HoverMenuButton (cfg, property, ...).

Moved HoverMenu from Docs.view.tree to Docs.view namespace.

The menu can be configured to:

- show columns.
- show "x" buttons after links.

Now this expand/collapse logic is encapsulated inside the tree and
when class is clicked it fires classclick event which we can handle
in the controller.

Now when favorite removed by clicking "x" in dropdown menu, the
star icon will also disappear from the class node in tree.

Instead of listing all the view classes in Controller, define inside
MenuButton that it depends on HoverMenu.

This contains the shared functionality of History and Favorites,
which both use localStorage.

Otherwise we will find "Ext" from store that only contains "Ext.Array".

Removed index_production.html - it goes too easily out of sync.
Instead using index.html as a template where placeholders are
replaced with data optionally passed from command line.  For that
added new options:

  --title - to set the title of page.
  --extjs-path - to use extjs/ext-all.js in production.
  --append-html - to add the analytics code.