greatly simplify event loop management

[dk]

breaks current PDL::Graphic::Simple though -- will make a separate PR

[coveralls]

Pull Request Test Coverage Report for Build 3928758870

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 12 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.03%) to 35.365%

---

Files with Coverage Reduction	New Missed Lines	%
/home/runner/work/PDL-Graphics-Prima/PDL-Graphics-Prima/blib/lib/PDL/Graphics/Prima/Simple.pm	12	9.48%
<!--	Total:	12		-->

Totals
Change from base Build 3923179860:	0.03%
Covered Lines:	853
Relevant Lines:	2412

---

💛 - Coveralls

[mohawk2]

Please could you resolve the conflict that now shows? Also, what version of Prima does this require?

[dk]

done

[mohawk2]

Thank you! Could you also rebase it against current master and force-push, rather than a merge commit? (That would also be an opportunity to squash in the "removed too much, restore" change :-) My best-case scenario is each commit is a small, meaningful change towards the end-goal of the PR.

[dk]

I'd love to learn how to do that because I have no idea, and am generally afraid of rebasing -- sorry :)

[mohawk2]

I did a squash-merge as discussed elsewhere, to keep the history looking understandable.