Boolean events can toggle!

[luigi-rosso]

Counterpart to https://github.com/rive-app/rive/pull/3723

• Updated core defs from rive master & ran dev/generate_core.sh
• Added logic for toggle event boolean changes.
• Added test to verify it works.
• Fixed a bug with hit shapes getting double-tracked due to artboard instances re-initializing state machines.

Unfortunately fixing the bug is required in this PR (instead of in a separate one) as it directly impedes the new toggle test from succeeding.

Also, I'm not sure why my clang-format insists on re-flowing some sections like you can see below in tryChangeState, etc.