Improved code quality

Integrated code analysis with sonar cloud and fixed all findings.
Changed internal HTTP interface: use lambda to define/write content stream

Android Support

Previous releases were not testet with Android. I have solved various issues caused by jvm dependencies that are unavailbale with Android.
Thank you, Ray Cai, for testing.

Support printer capabilities

bug fixes, refactoring & minor api changes

Object oriented API for RFC 8011 operations

Build now includes a standard jar and a fat jar (including the kotlin runtime)

RFC 8010 Encoding & Decoding

Encoding and Decoding completed.
IppClient and IppPrintService provide a high level API.
IppTool provides experimental support for ipptool files.