src,permission: add multiple allow-fs-* flags
Breaking change: Support for a single comma separates list for allow-fs-* flags is removed.
This means that
--alow-fs-read=/path/to/file.txt,/other/file/path.txt
Will be interpreted as a single file.
When using a single flag and including commas in said flag a warning will be emitted explaining the change.
Instead now multiple flags can be passed to allow multiple paths.
--allow-fs-read=/path/to/file.txt --allow-fs-read=/other/file/path.txt
Will allow access to both paths.