Cleaning up old msdf font files

[uguraslan]

Old MSDF Font File Detection:

• The plugin now scans all font files in the public folder and the temporary folder for automatically generated MSDF files.
• It identifies MSDF font files and checks if the lightningMetrics property exists in each file.
• If lightningMetrics is missing, it indicates that the file was not generated using the Lightning MSDF generator tool.

Temporary File and Variable:

• A temporary file is created to keep track of the cleanup process.
• A variable is introduced to prevent running the same cleanup process multiple times.

Warning Visibility:

• The function call for the cleanup process is intentionally placed within the default plugin function.
• This ensures that the warning messages are visible in the terminal output without the need to scroll up.
• Placing the function call outside the default plugin function would cause Vite to clean up the terminal output, hiding the warnings from the view.

[michielvandergeest]

Closing in favour of a simpler approach (#1d21c23)