* lily/default-actions.cc (Module): new file. default

* lily/default-actions.cc (Module): new file. default
{book,score}-print functions.

* scm/ly-from-scheme.scm (ly:parse-string-result): use new setup:
pass results via parseStringResult, lookup via ly:parser-lookup.

* lily/lily-parser.cc (Lily_parser): only clone lexer in
constructors.
(parse_file): encapsulate do_yyparse() in scm_set_current_module()
(parse_string): idem.

* ly/spanners-init.ly (assertBeamQuant): don't use #{ #} in init.