Support WebAssembly version of Olm.

* Olm no longer supports setting the stack/memory size at runtime,
   so don't (they're now set to be that in the Olm build).
 * Copy the wasm file from the Olm library (see multiple comments
   about it being in the wrong place and webpack being awful).

scripts/copy-res.js

@@ -57,6 +57,10 @@ const COPY_LIST = [
     ["res/themes/**", "webapp/themes"],
     ["node_modules/emojione/assets/svg/*", "webapp/emojione/svg/"],
     ["node_modules/emojione/assets/png/*", "webapp/emojione/png/"],
+    // XXX: This is tied quite heavily to the matching olm.js so it really should be
+    // in the bundle dir with the js to avoid caching issues giving us wasm that
+    // doesn't match our js, but I cannot find any way to get webpack to do this.
+    ["node_modules/olm/olm.wasm", "webapp"],
     ["./config.json", "webapp", { directwatch: 1 }],
 ];