MD3/MD5 Skins : use a more generic method looking for files, added Q3 legacy conventions for MD3

Author: vsonnier

Quake/common.c

@@ -1605,7 +1605,7 @@ is defined in VA_NUM_BUFFS.
 FIXME: make this buffer size safe someday
 ============
 */
-#define VA_NUM_BUFFS 4
+#define VA_NUM_BUFFS 8
 #if (MAX_OSPATH >= 1024)
 #define VA_BUFFERLEN MAX_OSPATH
 #else