Describe the bug

Minor bug involving passing a set as a kwarg to the msg method-- the set is correctly identified as an iterable, but is then presumed to be subscriptable in subsequent operations.

https://github.com/evennia/evennia/blob/574d7fbd4f65cae60c534fe592803057d452ed7b/evennia/server/sessionhandler.py#L252-L262

This does not work on set objects.

self.msg(locks=se

Brief summary of issue / Description of requested feature:

We have one usage of Q_FOREACH. This had been discouraged for some time (since 2016-06-16).
https://github.com/Mudlet/Mudlet/blob/c5285d17615029a7af245948f7dad18c8c39fecc/src/Host.cpp#L1785

Steps to reproduce the issue / Reasons for adding feature:

1. Look at Qt documentation within Qt Creator:

`Q_FOREACH(variable, co

Refactor classes (including tests) to resolve dependencies out of the IoC container with $this->dep = app($class::class) in the constructor, instead of through the constructor method arguments.

Constructor arg lists get quite long (see PopulationCalculator), and needs fixing test constructors whenever this changes.

Beep, boop, I'm a bot! Th

Sometimes there can be multiple ducks around at one moment. Right now they queue for being affected by fired shots, which generally works well. But the exception should be the fleeing behavior.