Added an additional 'Energy Weapon' flag to ext flags in weapon protos

* it forces the weapon to use EW skill regardless of its damage type.

Placed an object with PID 0x5000004 (corpse blood) to the lower z-layer
of the tile.

artifacts/scripting/headers/define_extra.h

@@ -31,6 +31,7 @@
 
 #define WEAPON_BIGGUN         256  // 0x00000100 - Big Gun
 #define WEAPON_2HAND          512  // 0x00000200 - 2Hnd (weapon is two-handed)
+#define WEAPON_ENERGYWEAPON  1024  // 0x00000400 - Energy Weapon (forces weapon to use Energy Weapons skill)
 
 #define ATKMODE_PRI_NONE        0
 #define ATKMODE_PRI_PUNCH       1  // 0001