Added a second mode of operation to cf_section_parse, where it takes a base

Added a second mode of operation to cf_section_parse, where it takes a base
pointer and uses offsets instead of absolute pointers (just like the way
XtGetApplicationResources works). Changed all modules that were using
cf_section_parse to use this new mode, so they can parse directly into their
instance structure instead of going through a static temporary variable.