Release 0.7.0.

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

package.json

@@ -2,7 +2,7 @@
   "name": "helios",
   "title": "Helios IDE for Amber",
   "description": "Helios IDE for Amber Smalltalk",
-  "version": "0.6.2",
+  "version": "0.7.0",
   "homepage": "https://lolg.it/amber/helios",
   "repository": {
     "type": "git",