Release 0.4.0.

Semver bump.
Uses Amber >0.18.1 and PlatformDom (no inlineJS: update yet).

package.json

@@ -2,7 +2,7 @@
   "name": "amber-contrib-legacy",
   "title": "Amber legacy items",
   "description": "Legacy IDE and a few other old non-core packages",
-  "version": "0.3.1",
+  "version": "0.4.0",
   "homepage": "https://lolg.it/amber/amber-contrib-legacy",
   "repository": {
     "type": "git",