Implement Thumb (32-bit) memory (ordered), multiply, extension and bitfield instructions (#3687)

* Implement Thumb (32-bit) memory (ordered), multiply and bitfield instructions

* Remove public from interface

* Fix T32 BL immediate and implement signed and unsigned extend instructions

ARMeilleure/Decoders/IOpCode32AluMla.cs

@@ -0,0 +1,11 @@
+namespace ARMeilleure.Decoders
+{
+    interface IOpCode32AluMla : IOpCode32AluReg
+    {
+        int Ra { get; }
+
+        bool NHigh { get; }
+        bool MHigh { get; }
+        bool R { get; }
+    }
+}