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a68d9d5410
Atto mixed vertical and horizontal alignment into a single selection, which does not make any sense. It also used CSS classes in such a way that those styles will break if/when Atto is removed. This commit: * removes the horizontal alignment from the dropdown - these are easily achieved using the existing Tiny UI * addresses a bug where existing styles (like horizontal alignment) were not preserved when editing the image * fixes a bug where the CSS selector was used instead of a CSS class name * recognises legacy TinyMCE class names and replaces these * switches from using random class names to using Bootstrap class utility classes for vertical alignment.