Add new HVAC components to library

These include the following types:

OS_CoolingTower_VariableSpeed
OS_Humidifier_Steam_Electric
OS_AirTerminal_SingleDuct_ConstantVolume_FourPipeInduction
OS_AirTerminal_SingleDuct_InletSideMixer
OS_AirTerminal_SingleDuct_VAV_HeatAndCool_Reheat
OS_AirTerminal_SingleDuct_VAV_HeatAndCool_NoReheat
OS_AirLoopHVAC_UnitaryHeatCool_VAVChangeoverBypass
OS_SetpointManager_MultiZone_MinimumHumidity_Average
OS_SetpointManager_MultiZone_Humidity_Minimum

Also, updated CoilCoolingDXSingleSpeed with overloaded constructor that
only requires model.  This has greatly simplified the process of making
library data using that type.