Const constructors from str, from slice for ArrayString, ArrayVec #205
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Add from_str_const constructor for ArrayString
Add from_slice_const constructor for ArrayVec
We can't make the ArrayVec constructors generic, not even where T: Copy,
so they are just templated out with macros for the integer types, quite limited.
These use "const error" for error handling - using panic would need Rust 1.57 (not yet released).
Closes #204