load script functions from installed modules and page scripts

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Find a way to load modules, plugins, or CDN scripts to provide world data and script source.

Look into sandboxing entity scripts. This will necessarily be a huge code injection vector and should come with a warning not to run untrusted modules, they have full access to browser/node APIs, etc. Only existing, previously-installed modules or <script> tags should be available, this should never include external code directly.