Feature/add sticker picker

Squash to avoid storing commits with stickers in it to avoid possible copyright problems and excess storage space. --hj

src/components/sticker_picker/sticker_picker.js

@@ -0,0 +1,52 @@
+/* eslint-env browser */
+import statusPosterService from '../../services/status_poster/status_poster.service.js'
+import TabSwitcher from '../tab_switcher/tab_switcher.js'
+
+const StickerPicker = {
+  components: [
+    TabSwitcher
+  ],
+  data () {
+    return {
+      meta: {
+        stickers: []
+      },
+      path: ''
+    }
+  },
+  computed: {
+    pack () {
+      return this.$store.state.instance.stickers || []
+    }
+  },
+  methods: {
+    clear () {
+      this.meta = {
+        stickers: []
+      }
+    },
+    pick (sticker, name) {
+      const store = this.$store
+      // TODO remove this workaround by finding a way to bypass reuploads
+      fetch(sticker)
+        .then((res) => {
+          res.blob().then((blob) => {
+            var file = new File([blob], name, { mimetype: 'image/png' })
+            var formData = new FormData()
+            formData.append('file', file)
+            statusPosterService.uploadMedia({ store, formData })
+              .then((fileData) => {
+                this.$emit('uploaded', fileData)
+                this.clear()
+              }, (error) => {
+                console.warn("Can't attach sticker")
+                console.warn(error)
+                this.$emit('upload-failed', 'default')
+              })
+          })
+        })
+    }
+  }
+}
+
+export default StickerPicker