[Large] Port dependent changes for CSP (and other good stuff) from WH…

…ATWG (#387)

* CSP integrations for Issue #201

Had to adapt "resulting URL record" -> "resulting parsed URL" (will fix
with changes to 2.5.2 eventually)

* Update refs to CSP3 (from CSP1 Note) for Issue #191

Also fix typo 'teh'

* Groundwork for realms #190 and scripting updates #165, #189

Importing dependent changes since last sync of WHATWG in mid-Jan.
Added JS-related terms

* intermediate: translated definitions in scripting section

* Imports 3 fetch script algorithms
and reorders a few sections to match WHATWG

* add algorithms for script creation

* WIP: Syncing changes through event handler section

* webappapi include mostly synced. script element section remains

* syncing changes for the script element

* pulling in more required sections for linking issues

* Further reducing linking issues

* fixes more linking issues

* Finally builds CLEAN!

* Adding some missing CSP changes

* Adding a few more CSP dependencies

* All CSP changes validated and builds clean

* Removed script modules

* tables in DTs don't render nicely; also fixed backtick use in a few places

* Fixes for @arronei's PR feedback

sections/attributes.include

@@ -158,7 +158,7 @@
       <td>"<code>true</code>"; "<code>false</code>"</td>
     </tr>
     <tr>
-      <th><code>contextmenu</code></th>
+      <th><{global/contextmenu}></th>
       <td><a>HTML elements</a></td>
       <td>The element's context menu</td>
       <td><a>ID</a>*</td>
@@ -552,6 +552,12 @@
       <td>Name of parameter</td>
       <td><a>Text</a></td>
     </tr>
+    <tr>
+      <th><code>nonce</code></th>
+      <td><{script}>; <{style}></td>
+      <td>Cryptographic nonce used in <a>Content Security Policy</a> checks [[CSP3]]</td>  
+      <td><a>Text</a></td>
+    </tr>
     <tr>
       <th><{form/novalidate}></th>
       <td><{form}></td>