Error::from_string_literal now takes direct char const*s, while
Error::from_string_view does what Error::from_string_literal used to do:
taking StringViews. This change will remove the need to insert `sv`
after error strings when returning string literal errors once
StringView(char const*) is removed.
No functional changes.
Reverts recent change introduced to support implicit symbolic permission
which broke the parser when multiple classes are specified.
The state machine must assume it's dealing with classes until an
operation character is consumed.
