Caniuse data should be optional

[ju1ius]

ATM the only way to build the plugin without caniuse data is to patch emmet.js

import emmet from 'emmet';
import 'emmet/bundles/snippets';
// -- commented out
//import 'emmet/bundles/caniuse';

export default emmet;

Caniuse data is quite large and makes little sense in a web-based editor like codemirror.
So we should have a way to opt-out and cut-down the bundle size by half.

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