9 segment bitmap drawing:

Use %x9(id) to draw an image in the whole current viewport using the
9 segment drawer (which draws the corners as normal and *tiles*
the middle segments to the needed width/height).

Future work is to make it scale instead of tile

Change-Id: Ic3ed1cad93f96091694801eb442e0da5a2401203

lib/skin_parser/tag_table.c

@@ -179,6 +179,7 @@ static const struct tag_info legal_tags[] =
     { SKIN_TOKEN_IMAGE_PRELOAD,         "xl", "SF|III", 0|NOBREAK },
     { SKIN_TOKEN_IMAGE_PRELOAD_DISPLAY, "xd", "S|[IT]I", 0 },
     { SKIN_TOKEN_IMAGE_DISPLAY,         "x", "SF|II", SKIN_REFRESH_STATIC|NOBREAK },
+    { SKIN_TOKEN_IMAGE_DISPLAY_9SEGMENT, "x9", "S", 0 },
     
     { SKIN_TOKEN_LOAD_FONT,             "Fl" , "IF|I", 0|NOBREAK },
     { SKIN_TOKEN_ALBUMART_LOAD,         "Cl" , "IIII|ss", 0|NOBREAK },

lib/skin_parser/tag_table.h

@@ -163,6 +163,7 @@ enum skin_token_type {
     SKIN_TOKEN_IMAGE_PRELOAD_DISPLAY,
     SKIN_TOKEN_IMAGE_DISPLAY,
     SKIN_TOKEN_IMAGE_DISPLAY_LISTICON,
+    SKIN_TOKEN_IMAGE_DISPLAY_9SEGMENT,
     
     /* Albumart */
     SKIN_TOKEN_ALBUMART_LOAD,