Major overhaul, with many breaking changes and new features.
Now possible to share data across templates.
Now possible to preassign data to specific templates.
Templates variables are now accessed without the $this pseudo-variable.
Improvements to how extensions are registered.
Now possible to add one-off template functions (without using an extension).
New folder theme mode (missing folder templates will fall back to the default folder).
New optional compiler adds automatic escaping and a cleaner template syntax.