v4.0.0

Major refactor.

• Renamed LibPlatform, LibAccessory, LibService, LibCharacteristic, LibObject to Platform, AccessoryDelegate, ServiceDelegate, CharacteristicDelegate, `Delegate;
• Rename UpnpMonitor to UpnpClient;
• Added CommandLineTool and CommandLineParser (from homebridge-hue-utils);
• Added command-line tools hap, json, and upnp (from homebridge-hue-utils);
• Added TypeParser (to replace OptionParser);
• Added automated tests for TypeParser using mocha;
• Added tutorial for homebridge-lib and for TypeParser using jsdoc;
• Changed the way dependencies are included through index.js - now using lazy initialisation.

Bump versions:

• NodeJS v10.15.0 LTS.