Main changes:
- GTK+2 has been replaced by GTK+3.
- A system for plug-in components has been implemented, allowing SmartSim to be expanded without the need for editing the main application's code.
- Graphics have been improved with a cleaner look.
- Improved reliability in saving and loading projects.
The plug-in system may undergo refinement in the future, and is currently not documented.
A updated manual is yet to be released, but the existing manual is still mostly complete.