Add assert to shell compartment.
Merge branch 'nat' of https://github.com/mozilla/shumway into nat
Switch to jpeg.ts
Remove top level declarations.
Export toNumber since it's used in some evaled code.
Made most modules have a module.ts file that declares module level properties and/or settings.
Added timeline buffers to avm2, parser, gfx and player modules. Profiling should collect data from them all.