Add support for additional keyword lists in Scintilla LexPerl

[submersible_toaster]

LexPerl? currently supports only one keyword list - which is being used for perl5 reserved words (real syntax).

I suggest that it would be very useful to have one or more additional keyword lists which could be filled dynamically by the editor/plugins.

eg;

having seen 'use Moose'; - in a file, add (@biglist_of_moosewords) or Error.pm try/catch etc.

Essentially make it possible for decoration of keywords that are common - but not perl5 core. and style them separately.