Table Borders for Left + Right

[max-legrand]

Would it be possible to implement the code changes found here:
PoiScript#31

Seems like only Top + Bottom borders are currently present, and this PR would add the ability to set borders for all sides.

[cstkingkey]

Table Borders for Left + Right are present. Please check again.

[max-legrand]

Gotcha think I might’ve been looking at outdated documentation! Appreciate the work you do on this crate!