Can't use magics in startup scripts

[SpencerPark]

As mentioned in #61, magics are not transformed before evaluating startup scripts which makes adding dependencies in those places much more awkward.

The kernel should transform such scripts before evaluating.

[jimmybow]

just use magic method directly

String[] mavenDependencies = {
    "net.sourceforge.plantuml:plantuml:8059"
};
getKernelInstance().getMavenResolver().addMavenDependencies(Arrays.asList(mavenDependencies));

see my IJAVA_STARTUP_SCRIPTS for plantuml magic ! https://github.com/jimmybow/docker-java-notebook/blob/master/data/jupyter/custom_IJava/custom.jshell