Closing issues relevant to T-lang on this repo

[workingjubilee]

My understanding is that T-lang is not interested in following discussion on the RFCs repo that is not actual RFC. Various proposals seem interesting but are unfortunately in the form of issues instead of RFCs. If someone wanted to pursue them as an RFC, they should open it as a PR (following the template where useful, as usual).

@rust-lang/lang I would like to ask that you formally FCP that

• the language team is not going to (formally) take suggestions from GitHub issues on the RFCs repo
• thus T-lang will not act on these GitHub issues as change proposals
• thus that all GitHub issues that are relevant to T-lang on this repo can simply be closed, with a directive to open an RFC or to pursue some other process, as appropriate