Preserve Layouts in Word exports

Following the changes to the editor experience for Confluence Cloud it is possible to include different layout columns for content on a page. This means that multi-column layouts can be mixed with no layouts on the same page.

Currently, when this content is exported from Confluence, the content is not preserved in the layout displayed on the Confluence page. This is similar behaviour to what occurs on Confluence Server/Data Center, however, there is not the workaround to use the Column/Section macros that are also available on these deployment types.

We should introduce support for the layouts which are possible with Confluence Cloud.