fix(launch): Remove interferences with Leiningen prep-tasks

Leininge prep-tasks (AOT compilation, javac) start new processes, including
code/configuration added by CCW, causing problems:

- would start ccw.server while AOT compiling (and preventing the shutdown
  of the compilation JVM because futures where created)
- etc.
feat(launch): improve lein launch by adding JVM options as does Leiningen
test(core): attempt to re-activate SWTBot tests