State refactoring, adds a sidebar example, extends the breadcrumb navigation, introduces an API class

src/components/board/BoardSidebar.vue

@@ -0,0 +1,45 @@
+<!--
+  - @copyright Copyright (c) 2018 Julius Härtl <jus@bitgrid.net>
+  -
+  - @author Julius Härtl <jus@bitgrid.net>
+  -
+  - @license GNU AGPL version 3 or any later version
+  -
+  - This program is free software: you can redistribute it and/or modify
+  - it under the terms of the GNU Affero General Public License as
+  - published by the Free Software Foundation, either version 3 of the
+  - License, or (at your option) any later version.
+  -
+  - This program is distributed in the hope that it will be useful,
+  - but WITHOUT ANY WARRANTY; without even the implied warranty of
+  - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  - GNU Affero General Public License for more details.
+  -
+  - You should have received a copy of the GNU Affero General Public License
+  - along with this program. If not, see <http://www.gnu.org/licenses/>.
+  -
+  -->
+
+<template>
+	<div>
+		Board sidebar {{ board.title }}
+	</div>
+</template>
+
+<script>
+export default {
+	name: 'BoardSidebar',
+	props: {
+		board: {
+			type: Object,
+			default: function() {
+				return {}
+			}
+		}
+	}
+}
+</script>
+
+<style scoped>
+
+</style>