PclTemplate: Template processing engine using string searching

This class implements a template processing engine that uses string searching to locate template place holder tags.

It can read templates from strings or files and search for template place holder tags. The place holder tags delimiters are configurable.

The template tags can be used to implement conditional template section processing and section iteration loops.

The processed templates can be returned as a string, stored on a file and served as part of the current script output.