Advanced Component Group Ordering

[jbrooksuk]

Closes https://github.com/cachethq/core/issues/201

This PR implements the ability to configure component groups to order its components in different ways.

To-do:

• [ ] Implement new ordering options into API.
• [ ] Add tests.

Currently, you can order by:

• ID
• Name
• Status
• Last Updated At
• Manual

When using "manual" mode, Cachet will continue to use the components.order column. This value is also used as the default ordering before applying the custom order.

From the dashboard you can now select the "Component Group Order" when editing a component group. Anything other than "Manual" will also require you to select an order direction.

[glipschitz]

I have done a fresh pull @jbrooksuk and don't see this update to be able to test for you.