[FEATURE] break_eternity.js in source code

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Is your feature request related to a problem? Please describe.
Right now, break_eternity.js is included in this package by including the source code instead of using an npm package.

Describe the solution you'd like
The code can either stay the way as is (and also run prettier/other formatters on it), or break_eternity.js could be removed from the source.

Describe alternatives you've considered
N/A, see next section.

Additional context
(from README.md)
This was done in order to implement the saving/loading system using class-transformer and reflect-metadata, and you cannot import directly from break_eternity.js as the package targets a version of javascript (es5) that is not supported by class-transformer and reflect-metadata.

In addition, reflect-metadata doesn't work due to the nature of esbuild.

If an alternative method exists that doesn't include the source code in this package, then I will revisit this.