Add reset view position button to model menu

Signed-off-by: Justin Georgi <justin.georgi@gmail.com>

modules/glmv.js

@@ -158,4 +158,15 @@ toggleFullScreen = function(glCont) {
     } else {
         glCont.requestFullscreen()
     }
+}
+
+/**
+ * Reset view to initial position
+ * 
+ * @param {ModelViewer} mView
+ */
+resetView = function(mView) {
+    mView.cameraOrbit = mView.cameraOrbit
+    mView.cameraTarget = mView.cameraTarget
+    mView.fieldOfView = mView.fieldOfView
 }