Schema compare Icon and other fixes (#6009)

* Changes to 1. Enable Icon for Schema Compare model view editor 2. Set context setting in editable drop down 3. Fix a console error

* new icons

* Changes as per PR comments

* Adding PR comments

* Fixing a spelling mistake

extensions/theme-seti/icons/images/scmp.svg

@@ -0,0 +1,5 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16">
+<title>SchemaCompare</title>
+<path d="M4.227,11.023l-.7.7L4.8,13H3.5A1.494,1.494,0,0,1,2,11.5V9H1v2.5a2.454,2.454,0,0,0,.2.973,2.487,2.487,0,0,0,1.332,1.332A2.454,2.454,0,0,0,3.5,14H4.8L3.523,15.273l.7.7L6.711,13.5Z"/>
+<path d="M12,6V0H4V10H8v6h8V6ZM5,9V1h6V6H8V9Zm10,6H9V7h6Z"/>
+</svg>

extensions/theme-seti/icons/images/scmp_inverse.svg

@@ -0,0 +1,10 @@
+<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 viewBox="0 0 16 16" style="enable-background:new 0 0 16 16;" xml:space="preserve">
+<style type="text/css">
+	.st0{fill:#FFFFFF;}
+</style>
+<title>SchemaCompare</title>
+<path class="st0" d="M4.2,11l-0.7,0.7L4.8,13H3.5C2.7,13,2,12.3,2,11.5c0,0,0,0,0,0V9H1v2.5c0,0.3,0.1,0.7,0.2,1
+	c0.3,0.6,0.7,1.1,1.3,1.3c0.3,0.1,0.6,0.2,1,0.2h1.3l-1.3,1.3L4.2,16l2.5-2.5L4.2,11z"/>
+<path class="st0" d="M12,6V0H4v10h4v6h8V6H12z M5,9V1h6v5H8v3H5z M15,15H9V7h6V15z"/>
+</svg>