adapt_framework: sourcemaps break with too many plugins

[oliverfoster]

Subject of the issue

It seems that bundling with requirejs and handing the code and maps to babel to transpile has some file-size limitations. The source maps seem to be silently rejected by babel when the bundled code reaches >~250KB.

On the up-side, there are outstanding compilation issues that need solving:

• import/export directives (remove requirejs)
• beyond ES8 (remove requirejs)

So I'm thinking about replacing requirejs as the bundler.