Also don't create the XTemplate object more than once.

Created separate component for showing the video page.

For now throwing away the next/prev functionality.

Exception when URL contained no # at all.

Created a minimal PHP script that serves plain HTML class documentation
when search engine requests _escaped_fragment_.  Otherwise it just
serves the old index page (now renamed to template.html).

At the moment the script outputs only docs for the class itself, not
for its members.

Previously the window.location was changed every time a tab was
activated. This resulted in behaviour that when one was to follow
link to #/api/SomeClass-method-foo he would get the method opened,
but URL changed to #/api/SomeClass.

Creates tree structure based on inheritance.

Most importantly the root node of ExtJS tree is now the Ext class.
No more is it stacked at the bottom of the tree.

Private classes are now always exported. UI decides whether to show
the or not.  At the moment the PackageLogic class has a config option
showPrivateClasses - in spe it will be connected to some button in UI.

This will allow us to have multiple implementations of tree creation logic.

Instead of Tree and TreeIcons there now is an Icons class, which
just detects tree-icon class name for each class.

This generalizes exampes/guides/videos trees.

It is now a base class and not specific to classtree.

Additionally create the tree nodes for examples and videos explicitly -
not simply applying some extra properties to existing data nodes.

- most of tree functionality is now in classtree.
  only the tree data creation is done by subclasses.

Favorites are being replaced with tabs.

Instead of plural "examples" for index page and singular "example"
for item page, now using longer "exampleindex" for index page,
which is easier to differenciate from "example".

Same for guides and videos.

Previously only classtree was singular and everything else was plural.
Better to have all singular, as it's easier to read/write.

- classtree
- guidetree
- videotree
- exampletree

Instead of /videos and /examples we now have /video and /example,
so it fits in with everything else:

- #/api/
- #/guide/
- #/video/
- #/example/

'url' is the default value.