Soyutnet

- Simplified PT net generation
- Added simpler PT connection syntax
- Imroved test flow
- Added PT connection validation
- Backwards compatible annotation by 'typing_extensions'

- Measured, improved compatibilty with older Python versions
- Added debug, error message logging

- Improved and documented token bindings

- Fix mistakes in PT net implementation
- Improved documentation
- Wrapped `asyncio.run` in a clean interface
- It also supports attaching asyncio tasks additional to the PT loops
- Improved graphviz generator
- Custom indentation and label names
- Custom coloring for `SpecialPlace`
- Can subscribe to transition firing notifications from any task
- Custom formatted debug printing
- Added new tests and examples

- Improved documentation
- Removed all global state, all related PTs belong to a particular SoyutNet instance
- Arcs can have multiple labels
- Token count records can be merged and sorted by time at the end of simulation
- Added Graphviz dot file generator
- New tests and examples

First version