Try to sort out terser code indentation

[matatk]

Had to use rollup-plugin-esformatter because the output from terser was a indented a bit oddly sometimes. Sense I might need to come up with a minimal test case for this, which could take a while. Would like to remove the extra dependency if possible.

[matatk]

Just tried it without the plugin and it still doesn't work; no cycles at the moment to attempt to fix it, so will continue with the plugin for now. It does cause some npm audit warnings, but seemingly nothing serious (though of course ideally I'd like to get these fixed).

[matatk]

Using rollup-plugin-prettier since 665236b