Fix ReShade shader repo fetching via MediaWiki API

[zany130]

Summary

Fixes shader repository list generation by switching the ReShade repo fetch
to the MediaWiki API instead of scraping the HTML page.

Background

PCGamingWiki no longer reliably allows direct HTML fetching of the ReShade page.
This causes repolist.txt to remain empty and results in only the hardcoded
astrayfx entry being available (see #1275 ).

Changes

• Replace the existing repo-fetch logic inside createShaderRepoList
  with a MediaWiki API–based implementation.
• No new files or dependencies added.
• Bash-only change limited to the createShaderRepoList function.
• Uses jq (already an optional dependency) to parse MediaWiki API JSON.

Testing

• Verified locally that repolist.txt is populated correctly.
• Custom entries in repocustomlist.txt are now respected.

[zany130]

Works great and actually fixed both the repos not being grabbed from PC gaming wiki and also fixes repos add to the custom repo file not downloading

[Copilot]

Pull request overview

This PR fixes ReShade shader repository list generation by replacing HTML scraping with the MediaWiki API for fetching data from PCGamingWiki. This change addresses reliability issues where direct HTML fetching was failing, resulting in empty repository lists.

Key Changes

• Replaced HTML scraping with MediaWiki API-based fetching using jq for JSON parsing
• Updated default ReShade version from 5.9.1 to 6.6.2
• Converted repocustomlist.txt from a hardcoded entry file to a well-documented template

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
steamtinkerlaunch	Updated version string to v14.0.20251227, changed default RSVERS to 6.6.2, and refactored createShaderRepoList function to use MediaWiki API with improved error handling and comment filtering
misc/repocustomlist.txt	Transformed from containing a single hardcoded repository entry to a documented template with the example entry commented out

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

This line contains trailing whitespace. Consider removing it for code cleanliness.