:ledger: Put sidebar icons in separate folders
:ledger: Rename modal
:bug: Fix wrong icons, delete useless channels icon
:book: Add commit conventions
:ledger: Import correct file

Modal.js has been renamed to Board.js
:bug: Fix wrong version number in built exe

Grunt task "rebrand" was not producing correct version numbers for
Windows executable
:lipstick: Fix JSHint errors
:book: Add coding style commit types
:bug: Fix EADDRINUSE errors on Linux/Mac

Clean up last socket on Linux-based systems to avoid EADDRINUSE errors
poping up.
:bulb: Add mute and hide controls

Enable to set whether an instrument should be shown or played in
instruments window.