Moving TabFolderLayout into SWT.

Fixes eclipse-platform#1317

Moving TabFolderLayout into SWT. Incorporated review comments.

Fixes eclipse-platform/eclipse.platform.swt#1317

Author: deepika-u

bundles/org.eclipse.ui.editors/META-INF/MANIFEST.MF

@@ -19,7 +19,7 @@ Export-Package:
 Require-Bundle: 
  org.eclipse.core.runtime;bundle-version="[3.29.0,4.0.0)",
  org.eclipse.core.expressions;bundle-version="[3.9.0,4.0.0)",
- org.eclipse.swt;bundle-version="[3.124.0,4.0.0)",
+ org.eclipse.swt;bundle-version="[3.128.0,4.0.0)",
  org.eclipse.ui.ide;bundle-version="[3.21.0,4.0.0)",
  org.eclipse.ui;bundle-version="[3.204.0,4.0.0)",
  org.eclipse.jface.text;bundle-version="[3.24.0,4.0.0)",