Figure out how to run ThinkingRock from ant

[ursjoss]

Running ant run from the root of the project will not properly start ThinkingRock. The way we found to do that involves NetBeans, but running another module like calendar.

We should figure out how to configure the build to start ThinkingRock from sources when calling ant run.

We should also add it to the justfile, providing the alternative to run just run.