Bug 202474 [Forms] Create a resource manager to share the bold font
If a FormToolkit is passed into FormEditor it is disposed upon disposal of the editor even though it may be shared.
bundles/org.eclipse.ui.forms/src/org/eclipse/ui/forms/widgets/FormText.java
* <p>
	 * 
	 * @return selected text, or an empty String if there is no selection.
	 * @exception SWTException
	 *                <ul>
	 *                <li>ERROR_WIDGET_DISPOSED - if the receiver has been
	 *                disposed</li>
	 *                <li>ERROR_THREAD_INVALID_ACCESS - if not called from the
	 *                thread that created the receiver</li>
	 *                </ul>
	 * @since 3.1
	 */
	public String getSelectionText() {
		checkWidget();
		if (selData != null)
			return selData.getSelectionText();
		return ""; 
	}
	/**
	 * Tests if the text is selected and can be copied into the clipboard.
	 * 
	 * @return <code>true</code> if the selected text can be copied into the
	 *         clipboard, <code>false</code> otherwise.
	 * @since 3.1
	 */
	public boolean canCopy() {
		return selData != null && selData.canCopy();
	}
	/**
	 * Copies the selected text into the clipboard. Does nothing if no text is