Now that Olm needs to be inited asynchronously anyway, we can just
pass the options to Olm.init(), and as long as we do that before we
start the js-sdk, we're all good.
This will means the olm js is now part of the main bundle but since
it's now just a wrapper around the wasm, this is probably faster.
Also add the directwatch flag to olm.wasm because otherwise it
doesn't seem to copy the file in watch mode...
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