new architecture for View classes

[4224] - all View classes can now inherit from RoxPageView, and redefine the protected methods.

[4225] - a new 'about' application, to prove that it works.

[4240] - first steps towards a template switcher.

A new way to include template files, to constrain the power of template files.

A later step will be to use an exchangeable $template_factory, that will allow template switching.

Advantages:

1. Template files included with the new mechanism can't use methods or private fields of the $view object. All dependencies have to be injected explicitly into the template, using the $args argument.
2. Some dependencies (currently only $words) are injected by RoxPageView, so the application writer doesn't need to care about it.
3. In the future we can use an exchangeable $template_factory object. Instead of the usual templates, it could return
   • mock templates for testing (which don't include a file, but only echo the template name.
   • templates in a different directory - this would have the effect of skinning.

see RoxPageView

In the meantime everything needed for RoxPageView is in /tools/ folder, and depends on other things in /roxlauncher/ (especially, to parse the "autoload.ini").

Will try to move it to alpha

This is released some time ago.