Insignificant cleanup
Use the pre-generated parser tag handlers everywhere and exclude the generator input files from embedding in the extension
Changes SWF.embed to take the target document as an argument

This make SWF.embed usable outside of the document itself.
Moves all code from the extension's iframe to a sandbox tied to that iframe

Preparation for sharing read-only code and functions between multiple instances of the AVM2
Merge pull request #208 from tschneidereit/sandbox

Sandboxing, part one