[Jetty Plugin] Use browser's decoding features when possible

[Almeida-a]

Right now, the decoding is done by the existing decoders in the user's operating system.

The codestreams in the pixel data of the stored dicom objects should be sent through the servlet response output stream to be decoded by the browser.

This feature should be employed when the following conditions are true:

• The browser supports the format decoding (verification of browser specifications must take place);
• The transfer syntax pertains to the formats covered by imodec.