SAK-25440 refactor and cleanup serialization stuff, classloader writing and reading complete, needs a good unit test still.  Fixed issues with toolSession serialization unit test is passing now

git-svn-id: https://source.sakaiproject.org/svn/kernel@132349 66ffb92e-73f9-0310-93c1-f5514f145a0a
SAK-25440 wrote a test case for the classloader stuff.  Its working! Need to test in the server now, have to track down an example of this first.

git-svn-id: https://source.sakaiproject.org/svn/kernel@132350 66ffb92e-73f9-0310-93c1-f5514f145a0a