Template can now both handle variable creation and command sequence.
They become essentially a command that can be instantiated.
Concept of command variable is being expanded to fit templates needs.
By defaults strings are now simple strings.
They can be turned to regexp with x or raw string with r.
Indentation is now handled globally with an i prefix.
nested blocks {} and sequences "do .. then .. end" are now merged.
The new sequence "do .. then .. end" has a unique frame.
Implemented support for group number through nesting of sequences.
New tree syntax uses {} instead of [] now that this is available
Removed confusing implicit "new", template now needs to be captured to be available.
Renamed the "template" browsing function to "wrapper".
Change odd syntax is' / has' to is () and has ()
Previous template calls where implicitely doing a concatenation. This can now
be controlled directly with the '@' reference. Opens up for the next step which
is management of containers in templates.
