used for various elements in the
TkGate interface.  The options that can be set through this page are:
<ul>
<li><b>Edit Window Colors</b> These options specify the color of elements in the main editor window.
<ul>
<li><b>Background:</b> Sets background color for the editing canvas.
<li><b>Instances:</b> Sets the color used for primitive gates and their labels.
<li><b>Modules:</b> Sets the color used for modules, other than the port names.
<li><b>Module Ports:</b> Sets the color used for port names on module