Major reworking of the generator, added junit5 tests.

Major reworking of the generator, added junit5 tests.
 - all values now go through Value.{Scalar,Array,Hash} with simpler
   semantics.  Value is now an interface and each instance is a record.
 - junit5 tests for some classes, they run from the makefile only as yet.
 - enhanced api format
  - flags and named options on some objects/fields
  - pattern matched 'things' add named-group's from the pattern to the map
  - namespace for certain options
 - enhanced templates
   - 'builtin function's for naming convention conversion.
   - relative paths better defined (using '/') including leading '..' parts
   - better range specification/behaviour
   - comparisons use numbers (long) if they are numbers
 - bit better logging
 - removed some dumb ideas/dead code etc.