Basic mentions support (#832)

Signed-off-by: Andrey Sobolev <haiodo@gmail.com>

plugins/view-resources/src/components/ObjectPresenter.svelte

@@ -0,0 +1,52 @@
+<!--
+// Copyright © 2021 Anticrm Platform Contributors.
+// 
+// Licensed under the Eclipse Public License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License. You may
+// obtain a copy of the License at https://www.eclipse.org/legal/epl-2.0
+// 
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// 
+// See the License for the specific language governing permissions and
+// limitations under the License.
+-->
+
+<script lang="ts">
+  import type { Class, Doc, Ref } from '@anticrm/core'
+  import { createQuery, getClient } from '@anticrm/presentation'
+  import { AttributeModel } from '@anticrm/view'
+  import { getObjectPresenter } from '../utils'
+
+  export let objectId: Ref<Doc>
+  export let _class: Ref<Class<Doc>>
+
+  const client = getClient()
+  let presenter: AttributeModel | undefined
+
+  const docQuery = createQuery()
+  let doc: Doc | undefined
+
+  $: docQuery.query(_class, { _id: objectId }, (r) => { doc = r.shift() })
+
+  $: if (doc !== undefined) {
+    getObjectPresenter(client, doc._class, { key: '' }).then(p => {
+      presenter = p
+    })
+  }
+</script>
+
+{#if presenter}  
+  <div class='presenter'>
+    <svelte:component this={presenter.presenter} value={doc}/>
+  </div>
+{/if}
+
+<style lang="scss">
+  .presenter {
+    display: inline-flex;
+    vertical-align: sub;
+  }
+</style>
+