Session and cookie fixes

* Fixed many bugs with sessions and cookies.
* Deprecated manipulating cookies or sessions within Response objects.
Tighter module integration.

Modified the module logic, server object and controller to allow
for much greater pluggability of modules into controllers.

More of the same to come for models and views.
Added forms module.
Added a few fields, the rendering works pretty well.
Added value support for simple fields.
Started adding validation.
Added form helper, validation and error reporting.
Added validation for all fields.
Working validation!
Fixed value detection for checkboxes.