Add SWT PDE contribution activity pattern binding

This filters all contributions from org.eclipse.swt.tools.* bundles if
"Plugin Development" activity is disabled.

Requires
eclipse-platform/eclipse.platform.ui#2967 to
filter also SWT Tools "e4" contributions.

Fixes #1869

Author: iloveeclipse

platform/org.eclipse.sdk/plugin.xml

@@ -129,6 +129,12 @@
             activityId="org.eclipse.plugInDevelopment"
             pattern="org\.eclipse\.pde/.*">
       </activityPatternBinding>
+
+      <activityPatternBinding
+            activityId="org.eclipse.plugInDevelopment"
+            pattern="org\.eclipse\.swt\.tools.*">
+      </activityPatternBinding>
+      
       <activityPatternBinding
             activityId="org.eclipse.debugSupport"
             pattern="org\.eclipse\.debug\.ui/.*">