New language concepts and features

[StoneCypher]

• Embeddable machine fragments Embeddable machine fragments  #235 aka Embedding machines in other machines #160
• Spread without self No-self spread #142
• Stripes Stripes #57
• Cycles Cycles #56
• Hooks Hooks #255
• operator kind #1256 and State field kind #1257
• Style cascade Style cascade #114
• HTML-like labels Some mechanism for GViz HTML-like labels #110
• Regular labels Distinguish the node name from the label text already #117
• Edge labels provide edge labels so people don't have to use actions as labels #326
• Named lists Named sequential groups #70 Apparently named lists parse. Implement and test their use #279 Named sequential groups should be subordinable #244
• HTML labels Support for GraphViz' nightmare HTML labels #264
• after timing issues - do we actually want after? #256 operator after #89
• Fully reversible parser ❤️ New parser should be perfectly reversible (recreate whitespace + comments) #134
• High unicode See if we can get high unicode working #102
• Factory machine name factory method Factory machine data factory method #459
• Input Tape Input #450
• Output Tape Output #457
• Rotate Add rotate to viewer #193
• Finite state tree automata finite state tree automata? #492