[meta] Things to consider before Solid v2

[titoBouzout]

Personal notes., but to consider. before Solid v2, subject to change.

• we seem to want to deprecate use: discussion https://discord.com/channels/722131463138705510/1435384712443990096 Consideration is that upon release use: usage may be marked as deprecated.
• we seem to want to deprecate the usage of magic refs discussion https://discord.com/channels/722131463138705510/1435384712443990096 Consideration is that upon release magic refs usage should be marked as deprecated, and people could use signals instead, as we support ref arrays as ref={[props.ref, myref]}
• createMutable seems to be removed but its still available in solid-primitives https://primitives.solidjs.community/package/mutable/
• It would be nice to remove relevance of createEffect and put it as lower as possible on a list. In an example, if there's a list that list createEffect and createMemo, createMemo should come first, and anything createEffect should come last.

May edit to link/add references.