Clam 2001 regex slash colon

[val-ms]

• Fix issue loading regex sigs containing '/' and ':'

  There is an issue parsing PCRE patterns if the pattern contains a '/' in
  the middle, followed by a ':'. When splitting the subsignature (or yara
  regex string) by ':' delimiters to identify the offset, it will
  inadvertently think that the '/' in the middle of the sig is the end of
  the PCRE string and will therefore consider the ':' in the string as
  valid delimiter instead of ignoring it for being inside of the regex
  string.

  The solution I came up with is to ignore all content after a '/' when
  tokenizing rather than ignoring content between a matching pair of /'s.
  This works for LDB signatures because PCRE subsignatures are always
  the last subsignature and because a ':' never comes after the PCRE
  string.
  It works for YARA rules because the cli_tokenize() function is only
  ever used on the regex strings, never on the whole rule.

  Fixes: Version 0.105 load yara regex failed #594

• Test: Add test for LDB & Yara regex rules with : + /

• Also update generated sys.rs file (unrelated, just neglected in previous change)