Use upgrade tool to rename files.
Use `upgrade namespaces`

Add basic namespaces with the upgrade tool.
Update most calls to App::uses() with upgrade tool.
Use current directory names

* Use new style directory names.
* Update composer.json
Panels now don't cause errors.
Fix more classname based errors and missing events.
Fix a bunch of errors around classnames.
A toolbar appears.

The toolbar now displays. There are many things not working yet:

* SQL log is non-operational.
* History Panel is busted.
* Tests are failing.
Update namespace to Cake\DebugKit.
Merge pull request #185 from cakephp/3.0-namespaces

3.0 Starting point