MultiplayerPeerExtension isn't an exact replacement for
NetworkedMultiplayerCustom, but at least it gets you moving in the right direction.
Engine.editor_hint couldn't be fixed by the renames map, because you have to add a `()` at the end.
Generally moves comments and some entries around, as well as fixing typos and miscellaneous inconsistencies.
To go more in detail on a few things:
- In comments, separate between class names and notes with "--";
- In comments, replace all "broke" with "-- Breaks"
- Moves `@GlobalScope` constants to its own group in `enum_renames`
- Move `{ "remove", "remove_at" },` underneath the Builtin Types methods.
- Move C#'s `AddNode3dGizmoPlugin` to where it should be, in alphabetical order.
- Give more details to some class renames.
- Comments out `remove` -> `remove_at`
This allows properly limiting what features depend on the RegEx module
(doing the actual conversion) and what features only require the renames
data (GDScript suggestions).
Also better excludes the conversion command line options when actually
disabling deprecated code.
Fixes#73029.
