Allow braces in column specification for array env

[psvenk]

The array environment supports (most of) the same column specifications as the tabular environment does; update the syntax highlighting to reflect this fact and avoid a texGroupError when using braces in the column specification.

Screenshots from a file that I threw together (with :colo default):

Before	After

I also updated test/test-syntax/test-array.tex and test/test-syntax/test-array.vim with a test case for this, along with an analogous test case for tabular to the .vim file because that was not already tested.

[lervag]

Are you sure about this? I've never found any documentation that supports this, and your example does not compile on my end...

[krypt-n]

The m{10} seems to require the array package. Replace it with e.g. l to make the example compile without it.

\documentclass{article}

\begin{document}
\[
    \begin{array}{*{4}{l}}
        5
    \end{array}
\]
\end{document}

[psvenk]

Sorry for the confusion. As @krypt-n observed, the examples in the test file do indeed require the array package. I had tested primarily with this file, which does compile on my end without any packages.

[lervag]

Ok, thanks! I've merged and applied some minor adjustments to make the test file compileable.