Refactor downloads and logging

[Lolig4]

📝 Changes in autodesk_fusion_installer_x86-64.sh

• Introduce REPO_URL variable and use it for download URLs.
• Add WINE_PFX variable and use it consistently.
• Remove cd usage to simplify workflow and avoid stateful directory changes.
• Make function definitions consistent by adding () everywhere.
• Centralize downloads via download_file(); optional extension downloads.
• Create a symlink from the Wine prefix Downloads to the installer downloads folder to avoid repeated copy steps.
• Improve Secure Boot detection and GPU/VRAM logic; update monitor resolution detection.
• Renamed the video_driver subdirectories to simplify the download logic.
• Added automated log file creation under $SELECTED_DIRECTORY/logs for specific Wine configuration/install steps, and clearer progress messages.
• Use prebuilt .desktop files instead of inline generation.
• Standardize sleep arguments by using sleep 2 (without the s) everywhere.

📑 Context

These changes improve the code structure and standardize some things, fix minor bugs, and can help to speed up development.

✅ Checklist:

• Tested the changes locally.
• Change version number.
• Change the time and date

🔗 Testing Logs

Tested on: Fedora Linux 43 (KDE Plasma Desktop Edition), kernel 6.18.6-200.fc43.x86_64, KDE (Wayland), AMD Radeon Graphics (amdgpu, Mesa 25.2.7), Wine 11.0.
autodesk_install_terminal.log
FusionClientInstaller_1.log
FusionClientInstaller_2.log
WebView2_install.log
wineprefixes.log
winetricks_7zip.log
winetricks_cjkfonts_2.log
winetricks_dotnet452.log
winetricks_sandbox.log
winetricks_win11.log