add more avatar templates

VERSION

frontend/src/assets/template/avatar/overlay.png

frontend/src/assets/template/avatar/overlay1.png

frontend/src/assets/template/avatar/overlay2.png

frontend/src/assets/template/avatar/overlay3.png

frontend/src/assets/template/avatar/overlay4.png

frontend/src/assets/template/avatar/overlay5.png

frontend/src/assets/template/avatar/overlay6.png

frontend/src/assets/template/avatar/overlay7.png

frontend/src/assets/template/avatar/overlay8.png

frontend/src/components/Navbar.vue

frontend/src/components/canvas/Canvas.vue

frontend/src/components/canvas/utils.js

frontend/src/templates.js

frontend/src/views/avatar/Avatar.vue

frontend/src/views/avatar/OverlaySelect.vue

frontend/src/views/avatar/canvas.js

frontend/src/views/event_poster/EventPoster.vue

frontend/src/views/event_poster/canvas.js

frontend/src/views/reel/Reel.vue