API: Move tail-related APIs to another namespace (#1935)

* API: Move tail-related APIs to another namespace

* Add missing RAM cost config

* Remove setTailFontSize from NS namespace

markdown/bitburner.userinterface.movetail.md

@@ -0,0 +1,32 @@
+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [bitburner](./bitburner.md) &gt; [UserInterface](./bitburner.userinterface.md) &gt; [moveTail](./bitburner.userinterface.movetail.md)
+
+## UserInterface.moveTail() method
+
+Move a tail window.
+
+**Signature:**
+
+```typescript
+moveTail(x: number, y: number, pid?: number): void;
+```
+
+## Parameters
+
+|  Parameter | Type | Description |
+|  --- | --- | --- |
+|  x | number | x coordinate. |
+|  y | number | y coordinate. |
+|  pid | number | _(Optional)_ Optional. PID of the script having its tail moved. If omitted, the current script is used. |
+
+**Returns:**
+
+void
+
+## Remarks
+
+RAM cost: 0 GB
+
+Moves a tail window. Coordinates are in screen space pixels (top left is 0,0).
+