[refactor] Extracted PropertyBuilder (10m)
[skip] Added the initial Section class (1m) [#23a]
[improvement] Added the bidi property to sections (2m) [#23b]
[refactor] Made the it_should_have_property assertion more robust (5m)
[improvement] Added the form protection property to sections (3m) [#23f]
[improvement] Added the rtl_gutter property to sections (3m) [#23m]
[improvement] Added text direction to section properties (1m) [#23n]
[improvement] Added the section type property to sections (5m) [#23o]
[improvement] Added vertical text setting to section properties (5m) [#23p]
[refactor] Renamed it_should_have_property to it_should_have_value_property (1m)
[improvement] Added the document grid property to sections (10m) [#23e]
[improvement] Added line numbering to section properties (5m) [#23g]
[improvement] Added paper source to section properties (5m) [#23h]
[improvement] Added page margins to section properties (10m) [#23i]
[improvement] Added the pgNumType property to sections (20m) [#23j]
[improvement] Added the pgSz property to sections (5m) [#23k]
[refactor] Renamed Borders to ParagraphBorders (1m)
[improvement] Added pgBorders to sections (5m) [#23c]
[improvement] Added columns for sections (30m) [#23d]
[refactor] Extracted ContainerProperty (5m)