Summary
- simplified proofs
- updated for release;
- updated for release;
- merged
- updated for release;
- updated version;
- obsolete;
- less ambitious preview: discontinued preview-update / preview-source which did not work on the spot via WebviewPanel;
- misc tuning and clarification;
- obsolete;
- proper message passing -- discontinued obsolete auxiliary commands;
- clarified Panel; discontinued intermediate Content_Provider;
- removed duplicate (amending 5763d9a2f47d, 5aa9cb83e70e);
- update to WebviewPanel API, following initial version by Peter Zeller;
- Moved a number of general-purpose lemmas into HOL