beginning reorg of topic type settings

Directory structure changed
Updating URLs of schemas and scripts begun
Fixing schema paths and namespace URIs
Place topic-type scripts in consistent directory structure.

By placing the scripts under directories for the stages they belong to,
we avoid the need to list their names explicitly in config. We can
simply load the scripts found in the appropriate directories.
Fix script paths in config files to match reorg
Reorg eppo-simple topic types
Midway through debugging scripts after moves
Finished debugging scripts after moves.
Remove present-doctype as all templates factored out

Also renamed present-element to present-config-ref
Code cleanup. Removed commented-out code and redundant variables.
Moving utility functions include to config to avoid warnings, be consistent
Moved script settings to topic type config files

Needed to introduce a script-style config setting, and attribute for
script element, in order to select the correct toc build for generic
topics. Not really the right mechanism. Reflects the fact that not all
of the presentation layer is topic-type specific. Needs more thought on
how best to handle this.
Removing redundant presentation schemas from eppo-simple plugin
Move eppo-simple schemas to topic-type dirs
Update schemas and files to new schema locations.
Moving CSS and Oxygen framework files into new structure.