Merge branch 'invert' into 'next'

Give the inverted flashpal a constant

See merge request STJr/SRB2!1685

src/deh_tables.c

@@ -5088,6 +5088,7 @@ struct int_const_s const INT_CONST[] = {
 	{"PAL_MIXUP",PAL_MIXUP},
 	{"PAL_RECYCLE",PAL_RECYCLE},
 	{"PAL_NUKE",PAL_NUKE},
+	{"PAL_INVERT",PAL_INVERT},
 	// for P_DamageMobj
 	//// Damage types
 	{"DMG_WATER",DMG_WATER},

src/p_local.h

@@ -349,6 +349,7 @@ void P_FlashPal(player_t *pl, UINT16 type, UINT16 duration);
 #define PAL_MIXUP    2
 #define PAL_RECYCLE  3
 #define PAL_NUKE     4
+#define PAL_INVERT   5
 
 //
 // P_ENEMY