Allow discovery of "minecraft" folders (without dots)

[OpenBagTwo]

Summary

Addresses #140

List of Changes

• Updates gather command to search for folders named "minecraft" in addition to files named ".minecraft"
• Updates imports to pull various abstract base classes from collections.abc instead of typing (as the latter is deprecated)

Tech Debt and Other Concerns

Validation Performed

Using this version of EnderChest, I ran the following command to "gather" an instance that had recently been created by PrismLauncher:

$ enderchest gather instance instances/NewInstance/
Could not parse instance name from /home/openbagtwo/minecraft/instances/NewInstance/instance.cfg
Gathered MMC-like Minecraft installation from instances/NewInstance/minecraft

Starting with Minecraft 1.20, Mojang by default no longer allows worlds
to load if they are or if they contain symbolic links.
Read more: https://help.minecraft.net/hc/en-us/articles/16165590199181
==> Would you like EnderChest to add /home/openbagtwo/minecraft/EnderChest to /home/openbagtwo/minecraft/instances/NewInstance/minecraft/allowed_symlinks.txt?
==> [Y/n] y
/home/openbagtwo/minecraft/instances/NewInstance/minecraft/allowed_symlinks.txt updated.
EnderChest configuration written to /home/openbagtwo/EnderChest/enderchest.cfg

After that, linking to that instance worked as expected.

PR Type

• This PR introduces a breaking change (will
  require a bump in the minor version)
• The changes in this PR are high urgency and necessitate a hotfix or patch
  release (will require rebasing off of release)
• This is a release (staging) PR (maintainer use only)

Checklist:

• I have read the contributor's guide
• I have run mkdocs serve locally and ensured that all API docs and
  changes I have made to the static pages are rendering correctly, with all links
  working
• All tech debt concerns have been resolved, documented as issues, or otherwise
  accepted
• I agree to license my contribution to this project under
  the GNU Public License v3