ALL: Remove trailing whitespaces

This tries to make our code a bit more compliant with our code formatting
conventions. For future use, this is the command I used:
  git ls-files "*.cpp" "*.h" | xargs sed -i -e 's/[ \t]*$//'

graphics/surface.cpp

@@ -127,7 +127,7 @@ void Surface::vLine(int x, int y, int y2, uint32 color) {
 			*ptr = (uint16)color;
 			ptr += pitch / 2;
 		}
-	
+
 	} else if (format.bytesPerPixel == 4) {
 		uint32 *ptr = (uint32 *)getBasePtr(x, y);
 		while (y++ <= y2) {