[Cleanup] Remove m_inuse, m_z, and m_heading from object.h (#3083)

# Notes
- These are unsued.

zone/object.h

@@ -183,7 +183,6 @@ protected:
 
 	Object_Struct m_data;        // Packet data
 	EQ::ItemInstance *m_inst;        // Item representing object
-	bool   m_inuse;    // Currently in use by a client?
 	uint32 m_id;        // Database key, different than drop_id
 	uint32 m_type;        // Object Type, ie, forge, oven, dropped item, etc (ref: ContainerUseTypes)
 	uint32 m_icon;        // Icon to use for forge, oven, etc
@@ -191,8 +190,6 @@ protected:
 	float  m_max_y;
 	float  m_min_x;
 	float  m_min_y;
-	float  m_z;
-	float  m_heading;
 	bool   m_ground_spawn;
 	char   m_display_name[64];