Asciidoctor diagram extension, with support for AsciiToSVG, BlockDiag
(BlockDiag, SeqDiag, ActDiag, NwDiag), Ditaa, Erd, GraphViz, Mermaid,
Msc, PlantUML, Shaape, SvgBob, Syntrax, UMLet, Vega, Vega-Lite and
WaveDrom.