New QoL Update

Hey everyone, this is potentially a very minor update, but could be a significant quality-of-life adjustment for some players. No content has been changed or added to the demo, but the key mapping has been changed so that it's now possible to advance new text by downscrolling on a mouse wheel.

I'd wanted to incorporate this for some time, and EsoDev kindly helped sort out the issues with implementing it, so I figure there's no reason to wait on adding it into the public release.