Switch *_FLOOD constants to sequential rather than bits and add flood type lookup table

Using sequential constants for *_FLOOD constants means that we can use a simple lookup table to convert them
into text for display and IGNORE_* constants.

include/flood.h

@@ -8,22 +8,22 @@
 #define __flood_h_
 
 enum flood_type {
-	MSG_FLOOD = 0x0001,
-	PUBLIC_FLOOD = 0x0002,
-	NOTICE_FLOOD = 0x0004,
-	WALL_FLOOD = 0x0008,
-	WALLOP_FLOOD = 0x0010,
-	CTCP_FLOOD = 0x0020,
-	INVITE_FLOOD = 0x0040,
-	CDCC_FLOOD = 0x0080,
-	CTCP_ACTION_FLOOD = 0x0100,
-	NICK_FLOOD = 0x0200,
-	DEOP_FLOOD = 0x0400,
-	KICK_FLOOD = 0x0800,
-	JOIN_FLOOD = 0x1000
+	MSG_FLOOD,
+	PUBLIC_FLOOD,
+	NOTICE_FLOOD,
+	WALL_FLOOD,
+	WALLOP_FLOOD,
+	CTCP_FLOOD,
+	INVITE_FLOOD,
+	CDCC_FLOOD,
+	CTCP_ACTION_FLOOD,
+	NICK_FLOOD,
+	DEOP_FLOOD,
+	KICK_FLOOD,
+	JOIN_FLOOD
 };
 
-#define FLOOD_FLAG(t) ((unsigned)(t))
+#define FLOOD_FLAG(t) (1U << (t))
 
 int BX_check_flooding(char *nick, enum flood_type type, char *line, char *channel);
 int BX_is_other_flood(ChannelList *channel, NickList *nick, enum flood_type type, int *t_flood);