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.settailfontsize.md

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+<!-- 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; [setTailFontSize](./bitburner.userinterface.settailfontsize.md)
+
+## UserInterface.setTailFontSize() method
+
+Set the font size of the tail window of a script.
+
+**Signature:**
+
+```typescript
+setTailFontSize(pixel?: number, fn?: FilenameOrPID, host?: string, ...args: ScriptArg[]): void;
+```
+
+## Parameters
+
+|  Parameter | Type | Description |
+|  --- | --- | --- |
+|  pixel | number | _(Optional)_ Optional. The new font size in pixels. If omitted, the default tail font size is used. |
+|  fn | [FilenameOrPID](./bitburner.filenameorpid.md) | _(Optional)_ Optional. Filename or PID of the target script. If omitted, the current script is used. |
+|  host | string | _(Optional)_ Optional. Hostname of the target script. Defaults to the server this script is running on. If args are specified, this is not optional. |
+|  args | [ScriptArg](./bitburner.scriptarg.md)<!-- -->\[\] | Arguments for the target script. |
+
+**Returns:**
+
+void
+
+## Remarks
+
+RAM cost: 0 GB
+
+This overwrites the tail font size and forces an update of the tail window's contents.
+
+If ran without a filename or pid, this will affect the current script's tail window.
+
+Otherwise, the PID or filename, hostname/ip, and args… arguments can be used to target the tail window from another script. Remember that scripts are uniquely identified by both their names and arguments.
+