Lexer bugs found by fuzzer

[Neil Hodgson]

Allen Yen has been running a fuzzer over Lexilla and has found some bugs for various languages.

I encourage people that use these languages to check and comment on whether the changes are worthwhile and complete or should more be done.

DMIS
Julia
Perl
Raku
TCMD
TeX
VisualProlog
X12

The pull requests are linked from issue 388

https://github.com/ScintillaOrg/lexilla/issues/388

Neil