Update Loading Placeholder - Add Methods

[lrljoe]

This fix is to add new methods for controlling the Loading Placeholder content for the table.

This is currently in development, as tests need adjusting.

setLoadingPlaceholderContent

You may use this method to set custom text for the placeholder:

setLoadingPlaceholderContentBlade

You may use this method to set a custom content blade. This will be wrapped in a and element (which can be customised as below).

setLoadingPlaceholderBlade

As an alternative to the setLoadingPlaceholderContentBlade, you may over-ride the default content entirely, in which case you must begin and end your custom blade with a element to avoid DOM issues.

All Submissions:

• [X] Have you followed the guidelines in our Contributing document?
• [X] Have you checked to ensure there aren't other open Pull Requests for the same update/change?

New Feature Submissions:

1. [ ] Does your submission pass tests and did you add any new tests needed for your feature?
2. [X] Did you update all templates (if applicable)?
3. [X] Did you add the relevant documentation (if applicable)?
4. [ ] Did you test locally to make sure your feature works as intended?

Changes to Core Features:

• [X] Have you added an explanation of what your changes do and why you'd like us to include them?
• [ ] Have you written new tests for your core changes, as applicable?
• [ ] Have you successfully ran tests with your changes locally?

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.