Kill off some usages of c_str.

Also changes some function params, but this is ok.
Some simplifications were also able to be made (ie. killing off strcmps with ==, etc).

Source/Core/VideoBackends/D3D/D3DUtil.h

@@ -5,6 +5,7 @@
 #pragma once
 
 #include <d3d11.h>
+#include <string>
 
 #include "Common/MathUtil.h"
 
@@ -41,9 +42,9 @@ namespace D3D
 		int Init();
 		int Shutdown();
 		int DrawTextScaled(float x, float y,
-							float size,
-							float spacing, u32 dwColor,
-							const char* strText);
+		                   float size,
+		                   float spacing, u32 dwColor,
+		                   const std::string& text);
 	};
 
 	extern CD3DFont font;