[releng] Improve the setup

Don't install GWT tools which don't work well anyway.
Turn off LSP validation because it generally causes problems.
diff --git a/releng/org.eclipse.emf.releng/EMF.setup b/releng/org.eclipse.emf.releng/EMF.setup
index 9b1e96b..16509fb 100644
--- a/releng/org.eclipse.emf.releng/EMF.setup
+++ b/releng/org.eclipse.emf.releng/EMF.setup
@@ -92,6 +92,18 @@
           key="/instance/org.eclipse.oomph.setup.ui/showToolBarContributions">
         <value>record</value>
       </detail>
+      <detail
+          key="/instance/org.eclipse.lsp4e//org.eclipse.wildwebdeveloper.xml/org.eclipse.core.runtime.xml">
+        <value>record</value>
+      </detail>
+      <detail
+          key="/instance/org.eclipse.lsp4e//org.eclipse.wildwebdeveloper.xml/org.eclipse.wildwebdeveloper.xsl">
+        <value>record</value>
+      </detail>
+      <detail
+          key="/instance/org.eclipse.lsp4e//org.eclipse.wildwebdeveloper.xml/org.eclipse.wildwebdeveloper.xsd">
+        <value>record</value>
+      </detail>
     </annotation>
     <setupTask
         xsi:type="setup:CompoundTask"
@@ -167,6 +179,22 @@
     </setupTask>
     <setupTask
         xsi:type="setup:CompoundTask"
+        name="org.eclipse.lsp4e">
+      <setupTask
+          xsi:type="setup:PreferenceTask"
+          key="/instance/org.eclipse.lsp4e//org.eclipse.wildwebdeveloper.xml/org.eclipse.core.runtime.xml"
+          value="false"/>
+      <setupTask
+          xsi:type="setup:PreferenceTask"
+          key="/instance/org.eclipse.lsp4e//org.eclipse.wildwebdeveloper.xml/org.eclipse.wildwebdeveloper.xsd"
+          value="false"/>
+      <setupTask
+          xsi:type="setup:PreferenceTask"
+          key="/instance/org.eclipse.lsp4e//org.eclipse.wildwebdeveloper.xml/org.eclipse.wildwebdeveloper.xsl"
+          value="false"/>
+    </setupTask>
+    <setupTask
+        xsi:type="setup:CompoundTask"
         name="org.eclipse.oomph.setup.ui">
       <setupTask
           xsi:type="setup:PreferenceTask"
@@ -1287,18 +1315,6 @@
   <project name="gwt"
       label="GWT">
     <setupTask
-        xsi:type="setup.p2:P2Task"
-        label="GWT">
-      <requirement
-          name="com.google.gdt.eclipse.suite.e44.feature.feature.group"/>
-      <requirement
-          name="com.google.gwt.eclipse.sdkbundle.feature.feature.group"/>
-      <requirement
-          name="com.google.appengine.eclipse.sdkbundle.feature.feature.group"/>
-      <repository
-          url="${gwt.tool.url}"/>
-    </setupTask>
-    <setupTask
         xsi:type="setup.targlets:TargletTask">
       <targlet
           name="EMF GWT"