Added Kaco inverter implementation

- Added Kaco inverter implementation
- Small refactoring
- Added release inverter power signal for simultaneous start of the
  inverters

PLC/POUs/Sunspec/Refu/ModelData/ST_SunspecInverterThreePhase.TcDUT

@@ -0,0 +1,145 @@
+<?xml version="1.0" encoding="utf-8"?>
+<TcPlcObject Version="1.1.0.1" ProductVersion="3.1.4026.12">
+  <DUT Name="ST_SunspecInverterThreePhase" Id="{f9acf95c-14fe-4c1e-9c73-dff4af6d43b5}">
+    <Declaration><![CDATA[// Sunspec register 40.070 - 40.120 (Size 52)
+TYPE ST_SunspecInverterThreePhase :
+STRUCT
+	// Model value
+	uiID : UINT;
+	
+	// Model length
+	uiL : UINT;
+	
+	// AC current. Sum of active phases
+	iA : INT;
+	
+	// AC current. Phase A
+	iAphA : INT;
+	
+	// AC current. Phase B
+	iAphB : INT;
+	
+	// AC current. Phase C
+	iAphC : INT;
+	
+	// AC current scaling factor
+	iASF : INT;
+	
+	// Phase voltage AB
+	uiPPVphAB : UINT;
+	
+	// Phase voltage BC
+	uiPPVphBC : UINT;
+	
+	// Phase voltage CA
+	uiPPVphCA : UINT;
+	
+	// Phase voltage AN
+	uiPhVphA : UINT;
+	
+	// Phase voltage BN
+	uiPhVphB : UINT;
+	
+	// Phase voltage CN
+	uiPhVphC : UINT;
+	
+	// Phase voltage scaling factor
+	iVSF : INT;
+	
+	// AC Power
+	iW : INT;
+	
+	// AC power scaling factor
+	iWSF : INT;
+	
+	// Line frequency
+	uiHz : UINT;
+	
+	// Line frequency scaling factor
+	iHzSF : INT;
+	
+	// AC apparent power
+	iVA : INT;
+	
+	// AC apparent power scaling factor
+	iVASF : INT;
+	
+	// AC reactive power
+	iVAr : INT;
+	
+	// AC reactive power scaling factor
+	iVArSF : INT;
+	
+	// AC power factor
+	iPF : INT;
+	
+	// AC power factor scaling factor
+	iPFSF : INT;
+	
+	// AC Energy
+	udiWH : UDINT;
+	
+	// AC Energy scaling factor
+	iWHSF : INT;
+	
+	// DC current
+	uiDCA : UINT;
+	
+	// DC current scaling factor
+	iDCASF : INT;
+	
+	// DC voltage
+	uiDCV : UINT;
+	
+	// DC voltage scaling factor
+	iDCVSF : INT;
+	
+	// DC power
+	iDCW : INT;
+	
+	// DC power scaling factor
+	iDCWSF : INT;
+	
+	// Cabinet temperature
+	iTmpCab : INT;
+	
+	// Heat sink temperature
+	iTmpSnk : INT;
+	
+	// Transformer temperature
+	iTmpTrns : INT;
+	
+	// Other temperature
+	iTmpOt : INT;
+	
+	// Temperature scaling factor
+	iTmpSF : INT;
+	
+	// Operating state
+	wSt : WORD;
+	
+	// Vendor specific operating state
+	wStVnd : WORD;
+	
+	// Bitmask value. Event fields.
+	dwEvt1 : DWORD;
+	
+	// Reserved for future use
+	dwEvt2 : DWORD;
+	
+	// Vendor defined events 1
+	dwEvtVnd1 : DWORD;
+	
+	// Vendor defined events 2
+	dwEvtVnd2 : DWORD;
+	
+	// Vendor defined events 3
+	dwEvtVnd3 : DWORD;
+	
+	// Vendor defined events 4
+	dwEvtVnd4 : DWORD;
+END_STRUCT
+END_TYPE
+]]></Declaration>
+  </DUT>
+</TcPlcObject>