Colorbox Image Styles: Allows 'alt' tag fallback for Caption, Fixes Floats

[patrickbrown-io]

These changes affect Colorbox Small - Square, Colorbox Small - Thumbnail, Colorbox Square, and Colorbox Small image styles.

1. Previously the 4 Colorbox image styles would only use a caption for the lower description of the click to zoom functionality that appears when zoomed. We have enabled a fallback such that if no caption is added, it will use the alt tag of the image. If no alt tag exists either, it will be blank. Resolves Lightbox images require image captions #1393
2. The Colorbox Image float left and float right were not being applied due to these being 'snowflake' images using a different template to enable the click to zoom functionality. This has been corrected and should float left or right as expected. Resolves Images floated to the left aren't floating #1379

[jnicholCU]

I'm getting problems where all the colorbox styles aren't displaying

Throws this console error:
image-style-configuration-definition-invalid Object
Read more: https://ckeditor.com/docs/ckeditor5/latest/support/error-codes.html#error-image-style-configuration-definition-invalid

This was on a brand new install.

[jnicholCU]

Requested changes fixed display issue. Everything working properly now. Approving and merging.