[9008] modelids for shapeshifts from dbc

this will correct some modelids:
form         old model, new model
FORM_TRAVEL: 632   --> 918      (now a bit smaller)
FORM_GHOUL:  10045 --> 25527    (whisp --> ghoul)
FORM_CREATUREBEAR: 902 --> 2281 (old brown horse -> bear)

implement shapeshift for spell 24347

this commit also
fix the errormessages with: "Race %u not found in DBC: wrong DBC files"
which were triggered from this code
and will fix the modelid for creature 2038
since it's also using a shapeshift aura and only got the horde-modelid

+ some new entries in ShapeshiftForm-enum
+ some research for the shapeshift.dbc

src/game/Unit.h

@@ -173,6 +173,11 @@ enum ShapeshiftForm
     FORM_AMBIENT            = 0x06,
     FORM_GHOUL              = 0x07,
     FORM_DIREBEAR           = 0x08,
+    FORM_STEVES_GHOUL       = 0x09,
+    FORM_THARONJA_SKELETON  = 0x0A,
+    FORM_TEST_OF_STRENGTH   = 0x0B,
+    FORM_BLB_PLAYER         = 0x0C,
+    FORM_SHADOW_DANCE       = 0x0D,
     FORM_CREATUREBEAR       = 0x0E,
     FORM_CREATURECAT        = 0x0F,
     FORM_GHOSTWOLF          = 0x10,
@@ -182,12 +187,14 @@ enum ShapeshiftForm
     FORM_TEST               = 0x14,
     FORM_ZOMBIE             = 0x15,
     FORM_METAMORPHOSIS      = 0x16,
+    FORM_UNDEAD             = 0x19,
+    FORM_FRENZY             = 0x1A,
     FORM_FLIGHT_EPIC        = 0x1B,
     FORM_SHADOW             = 0x1C,
     FORM_FLIGHT             = 0x1D,
     FORM_STEALTH            = 0x1E,
     FORM_MOONKIN            = 0x1F,
-    FORM_SPIRITOFREDEMPTION = 0x20
+    FORM_SPIRITOFREDEMPTION = 0x20,
 };
 
 // low byte ( 0 from 0..3 ) of UNIT_FIELD_BYTES_2