Transparency Support

[johnzhou721]

See the back block in here. Something like this might be useful.

[source: https://www.lego.com/en-us/product/elsas-frozen-castle-43238, extremely small portion taken for commentary]

Using

\documentclass{standalone}
\usepackage{tikzbricks}

\begin{document}

\begin{tikzpicture}
  \brick[color=blue, semitransparent]{4}{2}
\end{tikzpicture}

\end{document}

does not work and produces a fully opaque brick.

Sorry for filing so many issues... these are just interesting features I'd like to see supported, no pressure to actually support them.