Decimal updated per API Review

[DrusTheAxe]

Updated per API Review'd spec (#5413)

Notable changes for C++:

• Changed String conversions changed to trio of methods
  • to/from_string() = User's default locale
  • to/from_string_invariant() = Invariant
  • to/from_string(localeName) = explicit locale
• Added: 'TryFrom' methods for string parsing e.g. bool try_from_string(input_source, output_value)
• Deleted: Remove LCID from all API surfaces
• Deleted: char support as an integer (use std:int16_t)
• Added: Overloads for more string flavors:
  • PCSTR (current codepage)
  • PCWSTR
  • std::string
  • std::string_view
  • std::wstring
  • std::wstring_view
  • wil::zstring_view
  • HSTRING
  • winrt::hstring
• Changed: scale() and max_scale() return std::uint8_t
• Added: is_integer()

Notable changes for C#

• Changed: FromDecimalValue() renamed ToDecimal() (name functions after return type)

Notable changes for WinRT:

• Changed String conversions changed to trio of methods
  • To/FromString() = User's default locale
  • To/FromStringInvariant() = Invariant
  • To/FromString(localeName) = explicit locale
• Added: 'TryFrom' methods for string parsing e.g. Boolean TryFromString(input_source, output_value)
• Deleted: Char support as an integer (use Int16)
• Changed: scale() and max_scale() return std::uint8_t

[DrusTheAxe]

/azp run

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Azure Pipelines successfully started running 1 pipeline(s).

[DrusTheAxe]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[cwruss]

LGTM