First HMI update for 2018

This update is, mainly, for the BACnet/IP driver. The BACnet/IP driver was created about seven years ago and has now been updated to provide some of the features of the newer drivers.

·        Added character string data type support.

·        Added unsigned data type support.

·        Added writing a “Null” to an object.property.

·        Added additional error reporting.

·        Added a script command to write to any object property. This is to write to properties not configured as points and to write a “Null” to a property.

·        Added a helper to create BACnet script write commands.

·        A point/string testing window was added to the BACnet/IP configuration editor.