*Not sure how to replace the Copy, Paste and History Icons..?

Those are being drawn as a resource from the application.

What you can do is edit the sidepane.htm file to change them from a resource to an icon asset. The 2 lines are listed below.

<table><tr><td>&lt;moi:CommandButton icon="res://copyclipboardicon" command="copyclipboard" rcommand="copyclipboardwithorigin"&gt;&lt;moi:Text textid="Copy clipboard"&gt;&lt;/moi:CommandButton&gt;</td>
<td>&lt;moi:CommandButton icon="res://pasteicon" command="paste" </td></tr></table>

Just change the Res : / /xxxxxx lines to regular "icon="icons/xxxxx.png" lines..........