Add ICS Electronics 8099 Ethernet to Modbus Bridge

Pull the driver for the ICS 8099 Ethernet to Modbus Bridge into the project from my working repo.  The driver implements single 16 bit register read and write functions.  The driver was tested successfully on the 8099 provided with a TestEquity Model 140 thermal chamber.  This driver is part of the foundation needed to add a driver for the TestEquity chamber.