add new templates

VERSION

frontend/src/assets/previews/angle_event_left.png

frontend/src/assets/previews/angle_event_right.png

frontend/src/assets/previews/right_event.png

frontend/src/assets/template/angle_event_left/bg_black.png

frontend/src/assets/template/angle_event_left/bg_white.png

frontend/src/assets/template/angle_event_right/bg_black.png

frontend/src/assets/template/angle_event_right/bg_white.png

frontend/src/assets/template/right_event/bg_black.png

frontend/src/assets/template/right_event/bg_white.png

frontend/src/templates.js

frontend/src/views/angle_event_left/AngleEventLeft.vue

frontend/src/views/angle_event_left/canvas.js

frontend/src/views/angle_event_right/AngleEventRight.vue

frontend/src/views/angle_event_right/canvas.js

frontend/src/views/base_event/BaseEvent.vue

frontend/src/views/base_event/canvas.js

frontend/src/views/right_event/RightEvent.vue

frontend/src/views/right_event/canvas.js