Update to 2.42

Upstream changes:
2.42

Perltidy source to my preferred format. Fixed issues serializing
the global stash. Added test to detect if serializing the global
stash breaks anything.

2.41

Merged in all the open PR's. Some MUCH much later than I originally
intended to. Humble apologies to those who contributed fixes for that.

Switch from JSON::XS to Cpanel::JSON::XS as an optional test prereq.

Thanks to Karen Etheridge, Kent Frederic and Michael Schwern.

(wen)