Use Ember v3.12.0

Bumped JS dependencies where possible

gui/.eslintrc.js

@@ -1,7 +1,7 @@
 module.exports = {
   root: true,
   parserOptions: {
-    ecmaVersion: 2017,
+    ecmaVersion: 2018,
     sourceType: 'module'
   },
   plugins: [
@@ -30,8 +30,7 @@ module.exports = {
         'server/**/*.js'
       ],
       parserOptions: {
-        sourceType: 'script',
-        ecmaVersion: 2015
+        sourceType: 'script'
       },
       env: {
         browser: false,

gui/.travis.yml

@@ -1,7 +1,7 @@
 ---
 language: node_js
 node_js:
-  - "6"
+  - "8"
 
 sudo: false
 dist: trusty
@@ -17,13 +17,6 @@ env:
     # See https://git.io/vdao3 for details.
     - JOBS=1
 
-before_install:
-  - curl -o- -L https://yarnpkg.com/install.sh | bash
-  - export PATH=$HOME/.yarn/bin:$PATH
-
-install:
-  - yarn install --non-interactive
-
 script:
   - npm run lint:hbs
   - npm run lint:js

gui/package.json

@@ -18,20 +18,20 @@
     "test": "ember test"
   },
   "engines": {
-    "node": "6.* || 8.* || >= 10.*"
+    "node": "8.* || >= 10.*"
   },
   "devDependencies": {
     "@ember/jquery": "^0.6.0",
     "@ember/optional-features": "^0.7.0",
     "broccoli-asset-rev": "^3.0.0",
     "ember-ajax": "^3.1.0",
-    "ember-attacher": "^0.14.0",
-    "ember-cli": "~3.10.0",
+    "ember-attacher": "^0.15.1",
+    "ember-cli": "~3.12.0",
     "ember-cli-app-version": "^3.2.0",
     "ember-cli-babel": "^7.7.3",
     "ember-cli-dependency-checker": "^3.1.0",
     "ember-cli-eslint": "^5.1.0",
-    "ember-cli-htmlbars": "^3.0.1",
+    "ember-cli-htmlbars": "^3.1.0",
     "ember-cli-htmlbars-inline-precompile": "^2.1.0",
     "ember-cli-inject-live-reload": "^2.0.1",
     "ember-cli-mirage": "^0.4.15",
@@ -39,20 +39,20 @@
     "ember-cli-sri": "^2.1.1",
     "ember-cli-template-lint": "^1.0.0-beta.1",
     "ember-cli-uglify": "^3.0.0",
-    "ember-cli-update": "^0.34.7",
+    "ember-cli-update": "^0.41.0",
     "ember-concurrency": "^0.10.0",
-    "ember-data": "~3.10.0",
+    "ember-data": "~3.12.0",
     "ember-export-application-global": "^2.0.0",
-    "ember-load-initializers": "^2.0.0",
+    "ember-load-initializers": "^2.1.0",
     "ember-maybe-import-regenerator": "^0.1.6",
     "ember-qunit": "^4.4.1",
-    "ember-resolver": "^5.1.3",
-    "ember-simple-auth": "^1.8.2",
-    "ember-source": "~3.10.0",
+    "ember-resolver": "^5.2.1",
+    "ember-simple-auth": "^1.9.1",
+    "ember-source": "~3.12.0",
     "ember-toggle": "^5.3.2",
     "ember-truth-helpers": "^2.1.0",
     "eslint-plugin-ember": "^6.4.1",
-    "eslint-plugin-node": "^8.0.1",
+    "eslint-plugin-node": "^9.0.1",
     "loader.js": "^4.7.0",
     "qunit-dom": "^0.8.5"
   },

gui/testem.js

@@ -13,7 +13,6 @@ module.exports = {
         // --no-sandbox is needed when running Chrome inside a container
         process.env.CI ? '--no-sandbox' : null,
         '--headless',
-        '--disable-gpu',
         '--disable-dev-shm-usage',
         '--disable-software-rasterizer',
         '--mute-audio',