Migrate fragments to use blob rendering

[andrew-johnson-4]

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Blobs are infinitely better than fragments due to Type safety and better performance etc.

TODO:

• ✓ Blob calling convention (hello-world.lm)
• ✓ replace html blob rendering function with this new calling convention
• replace x86 code rendering fragments with this new calling convention

This should be about 2000 lines of code eliminated.