APSTUD-8264 After upgrade to 3.6 switching workspaces requires forcequit

under debugger it looks like AptanaDB/Derby cause this. Derby is overkill for what we're doing here, so I'm going to clean up the code to persist analytics events to disk, and remove Derby altogether.

We might need to call new FileWriter(dir, true)..to append the file contents instead of overwriting them.