Basic table editor

[ktraunmueller]

Provide a basic table editor / inspector panel. Advanced features will be added in separate tickets as demand arises.

Table environments supported in the first iteration:

• tabular

References:

• https://en.wikibooks.org/wiki/LaTeX/Tables
• https://texblog.org/2017/02/06/proper-tables-with-latex/
• https://www.tug.org/TUGboat/tb28-3/tb90hoeppner.pdf
• https://ctan.org/topic/table

For later iterations:

• Add support for tabularx
• Add support for tabu
• Partial grid lines using \cline
• Rows spanning multiple columns using \multicolumn
• Columns spanning multiple rows using \multirow
• Color

[ktraunmueller]

Added in 1.9