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/Render.cpp

@@ -255,7 +255,7 @@ Renderer::~Renderer()
 	D3D::Close();
 }
 
-void Renderer::RenderText(const char *text, int left, int top, u32 color)
+void Renderer::RenderText(const std::string& text, int left, int top, u32 color)
 {
 	D3D::font.DrawTextScaled((float)left, (float)top, 20.f, 0.0f, color, text);
 }