Macro load_int_le

macro_rules! load_int_le {
    ($buf:expr, $i:expr, $int_ty:ident) => { ... };
}

Loads an integer of the desired type from a byte stream, in LE order. Uses copy_nonoverlapping to let the compiler generate the most efficient way to load it from a possibly unaligned address.

Unsafe because: unchecked indexing at i..i+size_of(int_ty)