Cut CPU use and move heavy work off the UI thread

Redraws:
- Merge bursts of session and bandmap events into one redraw
  (Coalesced). Closed Bandmap and Available windows now unsubscribe.
- Grayline and Voice Keyer no longer subscribe to the session twice.
- Available summary, Score table and Log rows redraw only when their
  contents change. Telnet lines are added in batches.
- Bandmap view reuses its layout, shaped text and brushes. Grayline
  draws the coastlines as one cached shape.

Threads:
- Available, Bandmap colours, Check and Statistics do their judging
  and counting on the thread pool and draw the result on the UI thread.
- ContestLog takes a lock in Judge and in each method that changes the
  log, so a background Judge cannot read the indexes mid-edit.

Refresh rate:
- Statistics refreshes every 30 seconds and when the QSO count changes.
- Grayline refreshes at most every 15 seconds on session events.

Publish with ReadyToRun to cut startup JIT time.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

publish.sh

@@ -30,7 +30,7 @@ if [ -f "$archive" ]; then
 fi
 
 for project in Nonemm.App Nonemm.Recorder.App; do
-    ./build.sh publish "src/$project" -c Release -r "$rid" --self-contained -o "$out" || exit 1
+    ./build.sh publish "src/$project" -c Release -r "$rid" --self-contained -p:PublishReadyToRun=true -o "$out" || exit 1
 done
 rm -f "$out"/*.pdb