rename k-core to kernel

 - pom.xml files point to kernel instead of k-core
 - test-kompiled/marker contains text "marker" -- the issue here was actually that *-kompiled is gitignored
- JarInfo.java will be adapted to not depend on the .jar name (next commit)
JarInfo adaptation
also the kernel pom

this commit should work
add scala nature and files

 - add kore module to the mvn build system, make kernel (and only kernel) dependent on kore
 - add Scala KORE classes