Create a representation of a section.
A section affects preceding paragraphs or tables; i.e.
a section starts at the end of the previous section (or the beginning of
the document if no preceding section exists), and stops where the
section is declared.
When a new landscape section is needed, it is recommended to add a block_section
with type = "continuous"
, to add the content to be appened in the new section
and finally to add a block_section with page_size = page_size(orient = "landscape")
.