Read client signed int32 fields as signed

Add ResStream.read_long/write_long and use them for every CObjects
field the client loads with ResStream_ReadInt32 (sb.exe 0x7E1700)
as a value: rank info, attribute/skill/resource amounts, requirements,
door/deed/container/key fields, natural attacks, hardpoints, sound
event types and sparse VAL_LONG (LoadSaveBehavior<long>). Hash/enum
fields, list counts and flag words keep unsigned reads.

The binary is unchanged; JSON now shows e.g. -1 instead of 4294967295
(rank_hirelings, rank_rank) and -10 instead of 4294967286 (attr_adj).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

mbEditorPro2.0/arcane/objects/ArcKey.py

@@ -16,14 +16,14 @@ class ArcKey(ArcItem):
         self.key_keyval = stream.read_qword()
         self.key_keyval2 = stream.read_qword()
         self.key_keyval3 = stream.read_qword()
-        self.key_setting = stream.read_dword()
+        self.key_setting = stream.read_long()
 
     def save_binary(self, stream: ResStream):
         super().save_binary(stream)
         stream.write_qword(self.key_keyval)
         stream.write_qword(self.key_keyval2)
         stream.write_qword(self.key_keyval3)
-        stream.write_dword(self.key_setting)
+        stream.write_long(self.key_setting)
 
     def load_json(self, data):
         super().load_json(data)