textures: add dangling version of big vines. (#1396)

For when you want an upper area of a wall to have vines but you don't want them to unnaturally cut off at the bottom.

The regular vines have also been tweaked to get rid of some excessive solid colour blocks.

lumps/textures/textures.cfg

@@ -3831,6 +3831,11 @@ LITEBLU5        32      128 ; Variant of LITE3 but blue.
 *   BLITC0      24      112
 *   BLITC0      24      120
 
+A-VINE1A        256     64 ; dangling ends of the big vine textures
+*   W107_2      0       0
+A-VINE2A        256     64
+*   W106_2      0       0
+
 ; These textures are only in FreeDM
 
 #ifdef FREEDM