[9013] shapeshift spells

some shapeshift forms will give the player spells
so we need to tell the server that the player has those new
spells else he can't cast them since the server is thinking the player is
cheating

ps forms with spells:
FORM_GHOUL
FORM_THARONJA_SKELETON
FORM_TEST_OF_STRENGTH
FORM_BLB_PLAYER
FORM_TEST
FORM_ZOMBIE

--
so this mostly won't affect any ingame experience.. but good to have this
feature anyway.. :)

also changed errormessage if player has no reagents for spell..
thx to nofantasy

src/shared/revision_nr.h

@@ -1,4 +1,4 @@
 #ifndef __REVISION_NR_H__
 #define __REVISION_NR_H__
- #define REVISION_NR "9012"
+ #define REVISION_NR "9013"
 #endif // __REVISION_NR_H__