Macro fast32::make_base64_alpha

macro_rules! make_base64_alpha {
    ( $n:ident, $dec:ident, $enc:expr ) => { ... };
    ( $n:ident, $dec:ident, $enc:expr, $pad:literal ) => { ... };
    ( $n:ident, $dec:ident, $enc:expr, $fr:literal, $to:literal ) => { ... };
    ( $n:ident, $dec:ident, $enc:expr, $fr:literal, $to:literal, $pad:literal ) => { ... };
}

Creates an appropriate base64 alphabet (nopad, padded, simple, or with from:to mapping)

Note that the second identifier is to make the decoder a constant static variable, for const fn usage.

See examples in tests/alphabet.rs