Update .NET 5 Unicode data to version 13.0.0

[GrabYourPitchforks]

The Unicode Standard version 13.0.0 will be released on March 10, 2020. As per usual, since the .NET runtime carries a copy of Unicode-derived data, we should update our data files to match version 13.0.0 when it's released.

This will affect the following APIs:

• System.Globalization.StringInfo
• System.Globalization.CharUnicodeInfo
• System.Text.Encodings.Web.*
• System.Text.Json.* (since it depends on System.Text.Encodings.Web)

For instructions on how to update the runtime-carried Unicode data files, consult the GenUnicodeInfo docs and the STEW docs. Also update the UnicodeUcdVersion data throughout our .csproj files (see samples).

From a cursory reading of the changes to Unicode 13.0.0 I don't believe this will result in any of our tools introducing new API surface to the System.Text.Unicode.UnicodeRanges static type.

For reference, as of this writing our derived data is based on Unicode 12.1.0.

Edit: UAX#29 was also updated as part of the Unicode 13.0.0 wave. However, the changes that are relevant to us are wholly encapsulated within the data files. The core grapheme cluster break algorithm (Sec. 3.1.1) was not changed. So we don't need to make any code changes to TextSegmentationUtility.