Rename app id from occweb to extended_occweb, prep for App Store

Nextcloud's app id "occweb" is effectively unavailable for a new store
listing: the original Adphi/occweb still owns that App Store slot
(stale, v0.2.3), and el-choco/occweb_v2 has since published a
same-lineage rewrite under its own id. Rather than fight over the
"occweb" name, publish this fork under its own id, matching the
<name> this app has always had: "Extended OCC Web".

Renames every place the literal app id is used: info.xml <id> and the
auto-generated navigation <route>, script()/style() registrations in
templates/index.php, the TemplateResponse app name in
OccController::index(), the /apps/... base URL in js/index.js, and the
'app' log context tag in DbController.php. The GitHub repo name and
its <website>/<bugs>/<repository>/<screenshot> links are unaffected -
those identify the repo, not the Nextcloud app.

Docs (README, INSTALL-AIO.md, install.sh) updated to clone into and
reference an "extended_occweb" directory, since Nextcloud requires the
app folder name to match its id - a plain `git clone` of this repo no
longer produces a correctly-named install directory on its own.

Version bump to 0.4.0 given the scope (breaking change for anyone who
already deployed under the old "occweb" id - requires disable+remove
of the old app and a fresh enable under the new id, not an in-place
upgrade).

appinfo/info.xml

@@ -1,11 +1,11 @@
 <?xml version="1.0"?>
 <info xmlns:xsi= "http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="https://apps.nextcloud.com/schema/apps/info.xsd">
-    <id>occweb</id>
+    <id>extended_occweb</id>
     <name>Extended OCC Web</name>
     <summary>OCC Commands in a web terminal</summary>
     <description><![CDATA[Run OCC Commands in a web terminal]]></description>
-    <version>0.3.5</version>
+    <version>0.4.0</version>
     <licence>agpl</licence>
     <author mail="dillard.blom@ensembia.com" >Dillard Blom</author>
     <namespace>OCCWeb</namespace>
@@ -25,7 +25,7 @@
     <navigations>
         <navigation role="admin">
             <name>OCCWeb</name>
-            <route>occweb.occ.index</route>
+            <route>extended_occweb.occ.index</route>
             <icon>app.svg</icon>
             <type>link</type>
         </navigation>