void setVisible(boolean state) {
		isActive = state;
		PluginTool[] tools = getTools();
		for (PluginTool tool : tools) {
			tool.setVisible(state);
		}
	}
restores the object from an XML element

@param root an XML element to restore from
Ghidra/Framework/Project/src/main/java/ghidra/framework/project/tool/WorkspaceImpl.java