Added unified parameter class for renderers. Added WCS and version specifics. WMS still to come.
Added common base classes for various WCS handlers.
Migrated WCS handlers. All now use common base classes for most of their methods. WMS and some WCS EO handlers still to come.
Improved WCS interfaces to use render params objects.
Migrating coverage(-description) renderers to new calling method with params objects.
Adding 'native' coverage description and WCS capabilties renderer.