initial Appearance Tab implementation, added text size/UI scale option

src/components/settings_modal/tabs/appearance_tab.js

@@ -0,0 +1,39 @@
+import BooleanSetting from '../helpers/boolean_setting.vue'
+import ChoiceSetting from '../helpers/choice_setting.vue'
+import IntegerSetting from '../helpers/integer_setting.vue'
+import FloatSetting from '../helpers/float_setting.vue'
+import UnitSetting from '../helpers/unit_setting.vue'
+
+import SharedComputedObject from '../helpers/shared_computed_object.js'
+import ProfileSettingIndicator from '../helpers/profile_setting_indicator.vue'
+import { library } from '@fortawesome/fontawesome-svg-core'
+import {
+  faGlobe
+} from '@fortawesome/free-solid-svg-icons'
+
+library.add(
+  faGlobe
+)
+
+const AppearanceTab = {
+  data () {
+    return {}
+  },
+  components: {
+    BooleanSetting,
+    ChoiceSetting,
+    IntegerSetting,
+    FloatSetting,
+    UnitSetting,
+    ProfileSettingIndicator
+  },
+  computed: {
+    instanceWallpaperUsed () {
+      return this.$store.state.instance.background &&
+        !this.$store.state.users.currentUser.background_image
+    },
+    ...SharedComputedObject()
+  }
+}
+
+export default AppearanceTab