Audio attachments

And touch events for mobile quick reactions.

src/components/messages/MessageIncomingAudio.vue

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+<template>
+  <div>
+    <div class="messageIn">
+      <div class="sender">{{ messageEventDisplayName(event) }}</div>
+      <div class="audio-bubble">
+        <audio controls :src="src">Audio file</audio>
+        <QuickReactions :event="event" :reactions="reactions" />
+      </div>
+      <v-avatar class="avatar" size="40" color="grey">
+        <img
+          v-if="messageEventAvatar(event)"
+          :src="messageEventAvatar(event)"
+        />
+        <span v-else class="white--text headline">{{
+          messageEventDisplayName(event).substring(0, 1).toUpperCase()
+        }}</span>
+      </v-avatar>
+    </div>
+    <div class="time">
+      {{ formatTime(event.event.origin_server_ts) }}
+    </div>
+  </div>
+</template>
+
+<script>
+import messageMixin from "./messageMixin";
+import attachmentMixin from "./attachmentMixin";
+
+export default {
+  mixins: [messageMixin, attachmentMixin],
+};
+</script>
+
+<style lang="scss">
+@import "@/assets/css/chat.scss";
+</style>