Support webpack 5

[kpdecker]

Expands on/supersedes #100. Removing the parser logic simplifies the webpack API integration and number of points that break as a result of webpack 5 changes.

Note that karma-webpack would not play nicely when I installed webpack 5, so while this appears to compile correctly, it has not been tested at runtime with Webpack 5.

Possible fix for #77

[Deevian]

Any possibility of moving this forward?