Removed support for tiles

  * Also made the @Forward and @ExceptionHandling annotations
    repeatable
GenericChecksumRewriter no longer adds checksums to images

  * Updated ImageObjectRenderer to introduce the checksum
Separating struts from the renderers core
Removing deprecated JDom dependency
Cleanup
Cleaning up renderers internals
More cleanup
More cleanup
Unified ViewState params
Even more clenaup
Removed redundant taglibs
RenderMode is now an enum
Removed needless cache
Don't use Hashtables
Removed schema registry