Changes from last publication:
Ada.Strings.UTF_Encoding.Conversionsfix is no longer needed with GNAT CE 2021- A few fix
The objective of UXStrings is Unicode and dynamic length support for
strings in Ada.
UXStrings API is inspired from Ada.Strings.Unbounded in order to
minimize adaptation work from existing Ada source codes.
UID: 16687878996377aebb8e9856377aebb8e98b
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