Refactor analytics events (#209)

* Refactor analytics.js

* Update analytics calls in app.vue

* Update analytics calls in presets.vue

* Update analytics calls in tools.vue (and app.vue)

* Update analytics calls in global.vue

* Update analytics calls in domain.vue

* Update analytics calls in setup.vue

* Add list of all events to analytics.js

* Add custom copy to clipboard that emits event

* Emit the events from the components

* Update copyright year in all files touched

* Update analytics calls in download.vue

* Update analytics calls in ssl.vue

* Update analytics calls in certbot.vue

* Update analytics calls in domain.vue

* Update analytics calls in app.vue

* Note down 'Code snippet copied' events