Moved renderer registry code from engine to RendererRegistry class (was interface before).
Make sure to use thread-safe map, since there is no other synchronization in getTemplate method.
Removed template compilation feature.
Removed compiled compilation test.
TokenStream is now simple iterator-like class on top of list of tokens.
tokenStream in InterpretedTemplate is no longer object field.
context is no longer object field, but we pass it around.
output is no longer a field, but we pass it around.
transform method no longer needs to be synchronized.
Removed comment about compilation. This mode is no longer supported.