- implemented the string concatenation operator '..'. This is capable of stringifying all of the common types for output.

- gave OP_CONCAT some sane semantics. The way this was defined, by specifying the source operands as a range of registers instead of a pair like everything else made it completely useless for the task at hand.
- changed formatting for floats to %.5f which for normal output in a game makes more sense. For special cases there should be a special formatting function for ints and floats that can do more specialized conversions.

src/scripting/codegeneration/codegen.h

@@ -937,6 +937,21 @@ public:
 	ExpEmit Emit(VMFunctionBuilder *build);
 };
 
+//==========================================================================
+//
+//
+//
+//==========================================================================
+
+class FxConcat : public FxBinary
+{
+public:
+	FxConcat(FxExpression*, FxExpression*);
+	FxExpression *Resolve(FCompileContext&);
+
+	ExpEmit Emit(VMFunctionBuilder *build);
+};
+
 //==========================================================================
 //
 //	FxBinaryLogical