Filters - New Functionality - Custom filter labels

[lrljoe]

This PR is for moving the Filter Labels into the Filter Blades, and allowing for the customising of filter labels on a per-filter instance.

This makes several tweaks:

1. Removes Filter Labels from the toolbar.blade
2. Adds a new view component for Filter-Label
3. Adds a setCustomFilterLabel() method for Filters (allows you to set a specific blade file for a specific filter instance's label).
4. Adds the label to the filter blade directly.

This allows for greater customisation of the labels, and easier styling of the labels for those who wish to customise.

All Submissions:

• Have you followed the guidelines in our Contributing document?
• 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. Did you update all templates (if applicable)?
3. 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:

• 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?

[lrljoe]

See #1111