Completely remove Graphics::bigprint

The last two deprecated functions are:
- Graphics::Print
- Graphics::PrintWrap

These are used a lot, but they're relatively easy to replace, since the
only flag I probably have to immediately worry about is PR_CEN. I do
often need to add PR_FONT_* flags but I don't need to add any
PR_2X/PR_3X/PR_4X anymore.

desktop_version/src/Graphics.h

@@ -206,7 +206,6 @@ public:
 
     int PrintWrap(int x, int y, const std::string& s, int r, int g, int b, bool cen = false, int linespacing = -1, int maxwidth = -1);
 
-    void bigprint( int _x, int _y, const std::string& _s, int r, int g, int b, bool cen = false, int sc = 2 );
     void drawspritesetcol(int x, int y, int t, int c);