Add user file examples

Author: qu1ck

InteractiveHtmlBom/web/user-file-examples/user.css

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+/* Add custom css styles and overrides here. */

InteractiveHtmlBom/web/user-file-examples/user.js

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+// Example event listener.
+// Event argument will always be {eventType, args} dict
+
+EventHandler.registerCallback(IBOM_EVENT_TYPES.ALL, (e) => console.log(e));

InteractiveHtmlBom/web/user-file-examples/userfooter.html

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+<!-- example footer -->
+</div>
+<div style="width:100%; height: 50px;">
+    Hello footer
+</div>

InteractiveHtmlBom/web/user-file-examples/userheader.html

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+<!-- example header -->
+<div style="width:100%; height: 50px;">
+    Hello header
+</div>
+<div style="height: calc(100% - 100px)">