Your text is quite chaotic, it is hard to distinguish the quotes from your ideas what to do in Debian.
I think the main problem here are the programs which are presenting source code to humans (text editors, terminals, HTML pages in Gitlab etc.). Quotes should always terminate everything. A control character within a string literal should not have any effect outside of the quotes. The rules should be similar as we know them from syntax highlighting. All directional instructions should be terminated by the closing quote. However, since it is not realistic to free all relevant tools from all related bugs soon, compiler warnings make sense. There I think it does not make sense to ban all Unicode. Unicode clearly distinguishes printable and non-printable characters and so on. So all characters that print something clearly visible can be whitelisted. Regards
