Minor improvements.

• updated to Unicode 15.1
• update \X to match Unicode characters
• clarify . (dot) in the documentation when used with %unicode-enabled lexers, which is a catch-all pattern e.g. to report lexical errors

Word boundary anchors (\<, \>, \b and \B) can now be used anywhere in a pattern with the default RE/flex regex engine. Backtracking on word boundary anchors is performed by the regex engine to match input when anchors are embedded in a regex pattern (not at the ends of a pattern) such as bar.*\bfoo.

However, no backtracking is performed by the fast directly-coded DFA engines generated with --fast, which means that word boundary anchors that require backtracking, such as bar.*\bfoo, may not match with --fast. Please note that tokenizers and scanners typically don't use word boundaries in their patterns, but this new feature was added as part of a general RE/flex regex pattern library update and is also supported by its fuzzy matcher variant.

• fix FuzzyMatcher::DEL flag when this is the only flag selected for fuzzy matching
• fix FuzzyMatcher::matches() bug that in some cases incorrectly matched an extra character before the end of the input
• optimize find() for faster pattern searching
• updated saving the FSM pred[] hashes to a file, which has changed slightly to implement additional optimizations
• increase default buffer size REFLEX_BUFSZ to 128K from 64K for best throughput performance

Minor update to sync up the code base with the ugrep project.

Faster find() with additional SIMD acceleration intrinsics.

Faster find(); improved reflex --stdout option to include FSM tables.

Improve source code output of lexer class definitions; reflex will no longer read standard input when it is a terminal, so it can report an error when an input file is not specified.

Note: this is a re-upload of v3.3.5 shortly after the initial upload when a problem was found and fixed.

Fix yyrestart dropping the first character; faster find() with issue fixed in v3.3.3.

Fix yyrestart dropping the first character; faster find().