Rewrote updating RDF literals: replace, algorithmic, split.

* [RDF_CLEAN,SC] Removed rdf_expand_namespace/4, superseded by rdf_update_literal/7 with mode literal/3.
* [RDF_MAN,SC] Create a new subdirectory for RDF management tools.
* [RDF_MAN_LITERALS,SC] Updated literal management tool for new management architecture.
* [RDF_LITERAL,RDF_LITERAL_BUILD,SC] New module with 'build' tasks for RDF literals.
* [RDF_LITERAL,FIX] rdf_literal/4 was nondet.
* [RDF_LITERAL_BUILD,NEW] Rewrote the updating of RDF literals. Support for splitting lexical forms, replacing literal components, transforming lexical forms with arbitrary code.
* [RDF_LITERAL_BUILD,NEW] Added preview option for RDF literal updates. Supporting all its modes.
* [RDF_STORE_TABLE,EXT] Allow n-ary rows to be stored (was 4-ary).
* [RDF_CLEAN,SC] Removed literal stripping and splitting predicates.