Fixed regression in Word(min), reported by Ricardo Coccioli, good catch! (Issue Word min argument regression in Pyparsing 3.1.0 #502)

Fixed bug in bad exception messages raised by Forward expressions. PR submitted by Kyle Sunden, thanks for your patience and collaboration on this (Limit error message overriding #493).

Fixed regression in SkipTo, where ignored expressions were not checked when looking for the target expression. Reported by catcombo, Issue SkipTo removes ignored expression since v3.1.0 #500.

Fixed type annotation for enable_packrat, PR submitted by Mike Urbach, thanks! (Issue The enable_packrat type annotation prevents passing None for cache_size_limit #498)

Some general internal code cleanup. (Instigated by Michal Čihař, Issue Unused code in QuotedString #488)