Something like

id id2("){ ... }");

is no longer wrongly recognized as a "function"

id id2(") {
  ...
}
");

As the difference in the tests shows, this has the unfortunate side
effect that we no longer highlight something like

int f(param="default");

as a function declaration, but it is hard to imagine another way to
fix this (cf. “most vexing parse” problem).

Fixes #2207

\\\\|\\. is like \\. but causes catastrophic backtracking inside (...)* .

Very sorry about this!

Disable highlighting of unicode escape codes in python bytes literals,
as described in
https://docs.python.org/3/reference/lexical_analysis.html#string-and-bytes-literals.
So escape codes of the form "\N{name}", "\uxxxx" and "\Uxxxxxxxx" will
no longer be highlighted within bytes literals.  Add tests for escape
code highlighting in string and bytes literals.

Co-authored-by: andy <andy.yu2k@gmail.com>
Co-authored-by: Jean-Abou-Samra <jean@abou-samra.fr>

* Added COMAL-80 language highlight.

Co-authored-by: Jean Abou Samra <jean@abou-samra.fr>