(svn r9884) -Feature: 2 new zoom-out levels: 8 times and 16 times

-Codechange: unified the blitter function so we have 1 function for all zoom-levels
-Codechange: make most of the label functions work with zoom-level instead of magic numbers and big switches per zoom-level
-Codechange: MakeXXXDirty() functions didn't take into account zoom-level, but just used the biggest possible value
-Codechange: simplified blitter functions to avoid code duplication

src/texteff.cpp

@@ -352,6 +352,8 @@ void DrawTextEffects(DrawPixelInfo *dpi)
 			break;
 
 		case ZOOM_LVL_OUT_4X:
+		case ZOOM_LVL_OUT_8X:
+		case ZOOM_LVL_OUT_16X:
 			break;
 
 		default: NOT_REACHED();