Settings resource; oauth2 app authorization model; UI cleanup

app/unit/SettingsUnit.js

@@ -0,0 +1,24 @@
+const { Unit } = require('libflitter')
+
+class SettingsUnit extends Unit {
+    static get name() {
+        return 'settings'
+    }
+
+    static get services() {
+        return [...super.services, 'configs', 'models', 'output']
+    }
+
+    async go(app) {
+        const Setting = this.models.get('Setting')
+        const default_settings = this.configs.get('setting.settings')
+        for ( const key in default_settings ) {
+            if ( !default_settings.hasOwnProperty(key) ) continue
+            const default_value = default_settings[key]
+            this.output.debug(`Guarantee setting key "${key}" with default value "${default_value}".`)
+            await Setting.guarantee(key, default_value)
+        }
+    }
+}
+
+module.exports = exports = SettingsUnit