Remove dependency on JCIP

While it's nice to be able to simply reuse these "standard" annotations, doing so results in an extra (albeit small) dependency on all our modules and our users. When using Maven this is not really a big deal, but the extra JAR is annoying whenever the dependencies have to be explicitly managed.

We can in all likelihood just create our own annotations to replace the few in JCIP that we're using. This will result in changes to a lot of source files, but if we name the annotations the same it should be only imports.