Bumps Unity version from 2022.3.4f1 to 6000.0.49f1

[ViMaSter]

Summary

Updates to Unity 6.

• TextMesh Pro prompted me to install new default assets as they've changed between Unity versions, hence a few new files
• Unity changed the template of auto-generated files

PlayMode tests currently fail after updating with no code changes; Unity was made aware of this via a Bug Report: https://unity3d.atlassian.net/servicedesk/customer/portal/2/IN-102384
Appreciate any suggestions for potential workarounds.

Testing instructions

No gameplay changes; tests should succeed, and the game can be completed as before.

Additional information

• [ ] Changes UI
• [ ] Introduces new feature
• [ ] Removes existing feature
• [x] Has associated resource:
  • closes Upgrade to Unity 6 #517

[codecov]

Codecov Report

Attention: Patch coverage is 5.88235% with 64 lines in your changes missing coverage. Please review.

Project coverage is 57.86%. Comparing base (90f688d) to head (b259409).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
unity-ggjj/Assets/Scripts/Input/DebugControls.cs	10.81%	33 Missing ⚠️
...ts/Scripts/Input/Controls/Cheats/CheatsControls.cs	0.00%	31 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (90f688d) and HEAD (b259409). Click for more details.

HEAD has 2 uploads less than BASE

Flag	BASE (90f688d)	HEAD (b259409)
PlayModeTests_Suites_Scenes	1	0
PlayModeTests_Suites_Playthrough	1	0

Additional details and impacted files

@@             Coverage Diff              @@
##           develop     #516       +/-   ##
============================================
- Coverage    77.23%   57.86%   -19.37%     
============================================
  Files           95       95               
  Lines         3206     3242       +36     
============================================
- Hits          2476     1876      -600     
- Misses         730     1366      +636     

Flag	Coverage Δ
EditModeTests_Suites_Core	15.14% <0.00%> (-0.18%)	⬇️
EditModeTests_Suites_TextDecoder	15.94% <0.00%> (-0.18%)	⬇️
PlayModeTests_Suites_Playthrough	?
PlayModeTests_Suites_Scenes	?
PlayModeTests_Suites_Scripts	43.64% <5.88%> (?)

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[Copilot]

Pull Request Overview

This PR upgrades the project to Unity 6 (6000.0.49f1), pulling in updated TextMesh Pro defaults and regenerating input‐system wrappers to match the new Unity toolchain.

• Bump Unity version in docs, CI and project settings
• Update TextMesh Pro shader to the new default template (mask softness, UV unpacking, gamma fixes)
• Regenerate InputAction‐based input wrappers (new callbacks API, initialStateCheck flags)

Reviewed Changes

Copilot reviewed 70 out of 70 changed files in this pull request and generated 2 comments.

File	Description
Assets/TextMesh Pro/Resources/Shaders/TMP_Bitmap-Custom-Atlas.shader	Adopt new mask‐softness uniforms, remove old UV unpack
README.md	Update Unity version link and install instructions
.github/workflows/build_and_test.yml	Bump unityVersion to 6000.0.49f1
Assets/Scripts/Input/DebugControls.cs	Regenerated input‐system wrapper with improved APIs

Comments suppressed due to low confidence (1)

README.md:29

• [nitpick] Fix markdown list nesting: replace the double dash prefix with proper two-space indentation and a single dash (e.g., - Click on ...) to render the nested list correctly.

-  - Click on the `Unity 6` button, click on the `LTS` button, scroll to `Unity 6000.0.49f1` and click on the blue `INSTALL` button to download

[ViMaSter]

Marked as wontfix by Unity upstream; will revisit this, once there's significant updates to the InputSystem: https://issuetracker.unity3d.com/issues/ui-selectables-onclick-slash-submit-event-is-not-triggered-when-using-inputtestfixture-with-a-mock-keyboard-in-test-runner