Safer D first draft

[Walter Bright]

On 9/23/2024 2:02 AM, Walter Bright wrote:
> https://github.com/WalterBright/documents/blob/38f0a846726b571f8108f6e63e5e217b91421c86/safer.md

Initial implementation:

https://github.com/dlang/dmd/pull/17044