Log Message:
Update to 2.52

Upstream changes:
 2.52   - applied pod patch rt.cpan.org#79603

        - fixed rt.cpan.org#80006, it tolerates now whitespaces
	  after the block closing >

	- added -Plug parameter, which introduces plugin closures.
	  idea from rt.cpan.org#79694.
	  Currently available hooks are:
 	  pre_open, pre_read, post_read, pre_parse_value, post_parse_value

	- applied patch by Ville Skytt, spelling fixes.

	- fixed rt.cpan.org#85080, more spelling fixes.

	- applied patch rt.cpan.org#85132, which fixes a deprecation
	  warning in perl 5.18 and above. Fixes #85668 as well.

	- applied patch rt.cpan.org#85538, c-style comments
	  are ignored inside here-docs.

	- fixed rt.cpan.org#82637, don't use indirect object syntax
	  in pod and code.