previous tunnel fix was incomplete

- Add logo to language picker panel
- Add progress bar to panels

match the SigType selection style, and prep for PQ
add title to default

Dockerfile: migrate to eclipse-temurin:17-alpine base image

instead of package.html and Dummy.java

Correct copy and paste error: jre variant is sufficient for running the app. While I am here: provide qualified image reference to make podman happy

- Since the entire builder is discarded anyway there is no real point in
  uninstalling build-time package dependencies.
- Install ant from official pre-built binaries as well. Make version
  configurable.

ref: http://i2pforum.i2p/viewtopic.php?p=3399

add test servlet

susidns: Add bubble support

See merge request !233

(prep for PQ)

replace out.write(buf.toString) with out.append(buf)
to eliminate extra copy and object churn

seen live on the net