[someaddons]

Closes #558
Closes #

Changes proposed in this pull request

• Adds file conversion for common schematic file formats. On pack load we scan files for known filetypes and convert them to blueprint when needed, creating a blueprint with the same filename. After that our systems can just use the blueprint as usual.
• The converters are written by AI and contained to the conversion/ package. We can drop them anytime they cause issues e.g. while porting, as the feature is fully optional.

Testing

• [ x] Yes I tested this before submitting it.
• I also did a multiplayer test.

Review please