Dungeon crawler update

[lillianhidet]

Description

This PR improves the dungeon crawler tutorial, updates it to Godot 4.4, updates certain areas to match current best practice, and fixes minor correctness issues. Primarily:

• Updates project to Godot 4.4 compatibility
• Improves how weapon animation is handled, in a way that makes the tutorial easier to follow by compacting a lot of steps onto a single node
• Improves how UI is handled by introducing singleton nodes, which also removes the previously bad way of accessing the UI node
• Fixes a bug in which enemies would only damage the player upon entering the player hitbox, but would not continue to damage the player if they remained in contact with it.
• Many minor correctness changes

Second version of this PR as the initial version was done without first pulling from main... Which is also why this unfortunately has no commit history.

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