First bits of work for a MarkupTemplateEngine
Add support for multiple types of includes (groovy, escaped, unescaped)
Added support for template configuration
Added support for new lines and avoid use of "mkp."
Support for tags which have the same name as a macro
Reworked to get rid of StreamingMarkupBuilder
   * templates are statically compiled
   * unresolved methods/properties are executed in mixed mode
Small performance improvements
Fixed nested builder calls not being directly wired to methodMissing