64-bit by default; overriding is difficult

[codebudo]

JVM is started in 64-bit mode on all platforms. It's possible to override this by including a conf 'foo.json' line to your Winterfile that includes

{
  "64bit" : false
}

However, this is a little annoying for 32-bit platforms. There should either be some platform detection or at least an easier way of overriding the platform precision.