Feature updates, and some minor bugfixes.

Changelog for 1.11.0: https://github.com/lunarmodules/Penlight/blob/master/CHANGELOG.md#1110-2021-08-18
Changelog for prior releases rolled up here are in the same changelog.

This also moves to the "final" home, under lunarmodules, instead of the
temporary "tieske" maintainer's private github, see https://github.com/lunarmodules/Penlight/issues/339

Signed-off-by: Karl Palsson <karlp@etactica.com>