Extended symbolic enum parsing in JSON for integers and OR-ing.

Change-Id: Iedbd9914a1ca3897776fb92aa9a1fdfc4603da3c
Tested: on Windows and Linux
Tweak Go test.

Add more comments explaining the tests. Remove the extraneous 'superFuzz'
functionality. By default, do not compare to generated Java files.

Change-Id: Icb0aa8262e10035958639f9a88ca666694a2ce73