Support file system notifications

[vasu-dasari]

Currently sync polls directories and files for any changes and recompile the changed files and loads them. When sync starts monitoring more projects under one umbrella CPU can get overwhelmed with this polling. it will be good if sync looks for file system changes notifications and act upon them.

There is a project synrc/fs which provides filesystem change events. This supports Mac, Windows and Linux platforms. It would be good to integrate with this.