Implemented FORGE-1619 - Command constraint-new-group to create a new group
FORGE-1628 Add TemplateFacet and a MavenTemplateFacet.

This adds support for a Facet that is activated when the
src/main/templates directory is present in a Maven project.
Templates present in this directory can be retrieved through this
Facet.

Extracted and refactored from the Forge 1 scaffold-x plugin.
FORGE-1611: updated to jboss-parent 14
FORGE-1636: fixed label
FORGE-1637: Fixed hasDefaultValue behavior
FORGE-1623: Do not monitor non-existent files