v0.2.0 — streaming netcode, cross-play, mid-game joins

eduke32-wasm v0.2.0

Web build (eduke32-wasm-web.zip): the browser/WASM Duke3D with
serverless WebRTC+Nostr P2P multiplayer -- runs on macOS/Windows/Linux
via any browser. Also live on GitHub Pages.

Native desktop builds carry the SAME serverless WebRTC+Nostr
multiplayer via a native libdatachannel transport, wire-compatible
with the browser (native <-> browser interop). Binaries attach here
per platform as their build jobs go green.

Full Changelog: v0.1.0...v0.2.0