killed init registry lookup cache, wont be needed anymore
replaced directive registry with simpler setting registry.

the term "directive" has been dropped in the context of the scheme.
convert comma delimited style and script handles to arrays
handles are now always keys, and actions/callbacks are now always values in style and script global settings. it is no longer possible to define parameters to pass via settings, create custom function instead if necessary. see #90.
trivial syntax and comment fixes to global settings file.
dont allow overwriting of theme settings once set
massive refactoring to no longer track which theme defined component settings, fixes #90