Added minimizing JRE from config. Broke compat!

minimizejre option in config files must be a string, not a raw
true/false (use "true" or "false" for the same stuff, or "soft" or a
"path/to/a/file").  To be perfectly honest I haven't tried the file
handling yet, but it can do soft and hard removal of parts of
rt.jar, of which soft removal fills some requirements, namely
issue 6.  I am fairly certain there's a better way to do this, but
I just want to have this out there as a starting point.