UnprocessedCode, SnippetUnprocessedCode: extracted code transformation into separate classes implementing the CodeTransformer interface.
SnippetUnprocessedCode: add transformation to reclaim local variable slots taken by snippet context parameters.
SnippetUnprocessedCode: add support to query default snippet location.
SnippetUnprocessedCode, ReflectionHelper: moved getMethod() and getField() methods to ReflectionHelper.
Code: add support to query the number of method parameter slots.