upcoming renames

[ducin]

no stable version yet, no prod users - so 🤷

idea: remove sygnal as alternative constructor

• described here
• "feedback" for current sygnalyze
• although sygnals are still angular signals, it's true that it could be confusing to some and providing new features this way c = withMemento(signal(0)) seems less invasive and there's no "2 different types of signals" topic.

idea: if sygnal persists, change the name

• "feedback" here
• yep, signal and sygnal are too similar; I'm thinking of strictSignal, as update(readonly) is a stricter version of the method