Add Network.CMD_WHISPER

Network.CMD_WHISPER.md

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+## Server
+| Name | Type | Required | Description |
+| ---- | ---- | :------: | :---------- |
+| Length | Byte | ✗ |  |
+| ObjID | [ObjectID](Network.ObjectID) | ✗ | Always the client. |
+| Type | Byte | ✗ | `0x11 (17)` |
+| - | - | - | - |
+| Sender | [ObjectID](Network.ObjectID) | ✗ | Message sender. Short IDs aren't used here. |
+| Text | String | ✗ | Message |
+
+## Client
+| Name | Type | Required | Description |
+| ---- | ---- | :------: | :---------- |
+| Length | Byte | ✗ |  |
+| ObjID | [ObjectID](Network.ObjectID) | ✗ | The recipient. Long IDs only. |
+| Type | Byte | ✗ | `0x11 (17)` |
+| - | - | - | - |
+| Sender | [ObjectID](Network.ObjectID) | ✗ | Always an empty long ID. |
+| Text | String | ✗ | Message |