Remove beforescriptexecute/afterscriptexecute events

These have failed to garner implementer interest beyond one engine. Fixes #943.

source

@@ -59094,17 +59094,6 @@ o............A....e
 
    <!-- SCRIPT EXEC -->
 
-   <li>
-
-    <p>If <span data-x="concept-script-type">the script's type</span> is "<code
-    data-x="">classic</code>", <span>fire a simple event</span> named <code
-    data-x="event-beforescriptexecute">beforescriptexecute</code> that bubbles and is cancelable
-    at the <code>script</code> element.</p>
-
-    <p>If the event is canceled, then abort these steps.</p>
-
-   </li>
-
    <li>
 
     <p>If the script is <span data-x="concept-script-external">from an external file</span>, or
@@ -59169,15 +59158,6 @@ o............A....e
 
    </li>
 
-   <li>
-
-    <p>If <span data-x="concept-script-type">the script's type</span> is "<code
-    data-x="">classic</code>", <span>fire a simple event</span> named <code
-    data-x="event-afterscriptexecute">afterscriptexecute</code> that bubbles (but is not
-    cancelable) at the <code>script</code> element.</p>
-
-   </li>
-
    <li>
 
     <p>If <span>the script's type</span> is "<code data-x="">classic</code>" and the script is
@@ -118271,24 +118251,12 @@ INSERT INTERFACES HERE
      <td> <code>Window</code>
      <td> Fired at the <code>Window</code> after printing
 
-    <tr> <!-- afterscriptexecute -->
-     <td> <dfn><code data-x="event-afterscriptexecute">afterscriptexecute</code></dfn>
-     <td> <code>Event</code>
-     <td> <code>script</code> elements
-     <td> Fired at <code>script</code> elements after the script runs (just before the corresponding <code data-x="event-load">load</code> event)
-
     <tr> <!-- beforeprint -->
      <td> <dfn><code data-x="event-beforeprint">beforeprint</code></dfn>
      <td> <code>Event</code>
      <td> <code>Window</code>
      <td> Fired at the <code>Window</code> before printing
 
-    <tr> <!-- beforescriptexecute -->
-     <td> <dfn><code data-x="event-beforescriptexecute">beforescriptexecute</code></dfn>
-     <td> <code>Event</code>
-     <td> <code>script</code> elements
-     <td> Fired at <code>script</code> elements just before the script runs; canceling the event cancels the running of the script
-
     <tr> <!-- beforeunload -->
      <td> <dfn><code data-x="event-beforeunload">beforeunload</code></dfn>
      <td> <code>BeforeUnloadEvent</code>