Add ns.ui.[getStyles, setStyles, resetStyles]

Adds three Netscript functions to manipulate the user's styles like the
player can with theme.

markdown/bitburner.userinterface.resetstyles.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; [resetStyles](./bitburner.userinterface.resetstyles.md)
+
+## UserInterface.resetStyles() method
+
+Resets the player's styles to the default values
+
+<b>Signature:</b>
+
+```typescript
+resetStyles(): void;
+```
+<b>Returns:</b>
+
+void
+
+## Remarks
+
+RAM cost: cost: 0 GB
+