merge with master

.htmlhintrc

.travis.yml

package.json

scripts/check-yarn-lock.sh

scripts/default.env

scripts/lint-html.js

src/assets/images/dropdown_arrow.png

src/assets/images/dropdown_arrow@2x.png

src/assets/images/level_background.png

src/assets/images/level_background@2x.png

src/assets/images/level_fill.png

src/assets/images/level_fill@2x.png

src/assets/images/mic_level.png

src/assets/images/mic_level@2x.png

src/assets/images/speaker_level.png

src/assets/images/speaker_level@2x.png

src/assets/interactables/duck/DuckyMesh.glb

src/assets/interactables/duck/gltf/DuckyMesh.fbm/Ducky.jpg

src/assets/interactables/duck/gltf/DuckyMesh.gltf

src/assets/interactables/duck/gltf/DuckyMesh.json