simon/SCCD: The SCCD (Statecharts + Class Diagrams) compiler and runtime. @ da171175c568e168f3b9ffc6566096c9802ef02c

Joeri Exelmans efbf059d2d Rust: Fix removing of events. XML parser: assert state IDs are valid IDs in Rust. Add 2 tests.		4 lat temu
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big_step_maximality	efbf059d2d Rust: Fix removing of events. XML parser: assert state IDs are valid IDs in Rust. Add 2 tests.	4 lat temu
event_lifeline	ff59de9675 Re-render test files as SVG images.	5 lat temu
memory_protocol	ff59de9675 Re-render test files as SVG images.	5 lat temu
priority	b3d7175114 Extend readme. Add some comments.	5 lat temu