[enh] add BMA watcher + reorganize code

src/dwatcher.ts

@@ -23,8 +23,6 @@ process.on('unhandledRejection', (err) => {
     await dwatch(argv.conf || path.join(__dirname, '../app.yml'))
   } catch (e) {
     console.error(e)
-  } finally {
-    console.log('Finished')
   }
 })()