Add Network.CMD_SHORTLOC

Network.CMD_SHORTLOC.md

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+| Name | Type | Required | Description |
+| ---- | ---- | :------: | :---------- |
+| Length | Byte | ✗ |  |
+| ObjID | [ObjectID](Network.ObjectID) | ✗ | Always `0xfe (254)`. |
+| Type | Byte | ✗ | `0x04 (4)` |
+| - | - | - | - |
+| Drone | [ObjectID](Network.ObjectID) | ✗ | Always uses a short ID. |
+| Delta X | Byte | ✗ | Movement delta along the X-axis. |
+| Delta Y | Byte | ✗ | Movement delta along the Y-axis. |
+| Delta Dir | Byte | ✗ | Rotation delta. |