* tests based on jetty-runner do not work because
the jetty-runner JAR contains invalid Java SPI services config files
* due to these invalid files Jetty 11.0.20+ is unable to properly
initialize itself itself
* This change removes all tests based on jetty-runner
and bumps the Jetty version to 11.0.24
* There are already jobs using the Jetty Maven plugin to
launch a testing instance + run all tests
- add `testGraphviz`: request `version` as AsciiArt and search for
"Installation seems OK. File generation OK"
- irgnore `testGraphviz` inside github workflow tests except for the
docker container tests, since only in the docker container case
graphviz is available
- add `testMonacoEditorWebJar`: request `loader.js` and check if the
server answers with status code 200
- add a note inside the pom where the webjar versions are hard coded
inside the project
- revert the 4 missing tests, e.g. proxy test from commit 20468f5
- add virtual host name `test.localhost` to embedded jetty server
(JUnit Tests) since localhost and IP-Addresses are no longer
supported by the proxy and use this address inside proxy `src`
- add `test-localhost` support for the docker tests. To support
this the docker hostname need to be set to test.localhost by:
`--hostname=test.localhost` (only for the docker tests)
- proxy: add file format support for PDF
- proxy: add error messages on "bad request" response
- proxy: remove dead code
- old proxy: add error messages on "bad request" response
- fix incorrect README link to docs
- add `HTTP_PROXY_READ_TIMEOUT` option -- close#240
