Zoning: Remove unimplemented modes, fix some whitespace and style issues,

add missing licence headers, move/rename some declarations, fix sprite
ID allocation, update to build on trunk.

src/gfxinit.cpp

@@ -193,7 +193,7 @@ static void LoadSpriteTables()
 		);
 	}
 
-	LoadGrfFile("innerhighlight.grf", SPR_INNER_HIGHLIGHT_BASE, i++);
+	LoadGrfFile("innerhighlight.grf", SPR_ZONING_INNER_HIGHLIGHT_BASE, i++);
 
 	/* Initialize the unicode to sprite mapping table */
 	InitializeUnicodeGlyphMap();