Removes IsHandgun() proc, adds slot flag

code/setup.dm

@@ -166,6 +166,7 @@
 #define SLOT_DENYPOCKET 4096  // This is to  deny items with a w_class of 2 or 1 from fitting in pockets.
 #define SLOT_TWOEARS    8192
 #define SLOT_TIE        16384
+#define SLOT_HOLSTER	32768 //16th bit
 
 // Flags bitmasks.
 #define STOPPRESSUREDAMAGE 1 // This flag is used on the flags variable for SUIT and HEAD items which stop pressure damage. Note that the flag 1 was previous used as ONBACK, so it is possible for some code to use (flags & 1) when checking if something can be put on your back. Replace this code with (inv_flags & SLOT_BACK) if you see it anywhere