Added support for TIME types

- fixed writing string registers
- refactoring and more comments
- fixed dc exception handling
- fixed some null reference bugs

Examples/TestRegisters.cs

@@ -0,0 +1,52 @@
+using MewtocolNet;
+using MewtocolNet.RegisterAttributes;
+using System;
+using System.Collections;
+
+namespace Examples {
+    public class TestRegisters : RegisterCollectionBase {
+
+        //corresponds to a R100 boolean register in the PLC
+        [Register(100, RegisterType.R)]
+        public bool TestBool1 { get; private set; }
+
+        //corresponds to a R100 boolean register in the PLC
+        [Register(RegisterType.X, SpecialAddress.D)]
+        public bool TestBoolInputXD { get; private set; } 
+
+        //corresponds to a DT1101 - DT1104 string register in the PLC with (STRING[4])
+        [Register(1101, 4)]
+        public string TestString1 { get; private set; }
+
+        //corresponds to a DT7000 16 bit int register in the PLC
+        [Register(7000)]
+        public short TestInt16 { get; private set; }
+
+        //corresponds to a DTD7001 - DTD7002 32 bit int register in the PLC
+        [Register(7001)]
+        public int TestInt32 { get; private set; }
+
+        //corresponds to a DTD7001 - DTD7002 32 bit float register in the PLC (REAL)
+        [Register(7003)]
+        public float TestFloat32 { get; private set; }
+
+        //corresponds to a DT7005 - DT7009 string register in the PLC with (STRING[5])
+        [Register(7005, 5)]
+        public string TestString2 { get; private set; }
+
+        //corresponds to a DT7010 as a 16bit word/int and parses the word as single bits
+        [Register(7010)]
+        public BitArray TestBitRegister { get; private set; }
+
+        //corresponds to a DT1204 as a 16bit word/int takes the bit at index 9 and writes it back as a boolean
+        [Register(1204, 9, BitCount.B16)]
+        public bool BitValue { get; private set; }
+
+        //corresponds to a DT7012 - DT7013 as a 32bit time value that gets parsed as a timespan (TIME)
+        //the smallest value to communicate to the PLC is 10ms
+        [Register(7012)]
+        public TimeSpan TestTime { get; private set; }  
+
+
+    }
+}