Change all public types in namespace Cysharp.Text to internal (axuno#372

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* Change all public types in namespace Cysharp.Text to internal

* Regression caused by axuno#368
* Stop namespace collision with Cysharp.Text nuget package
* Affects: class, struct, interface, delegate, enum
* using https://github.com/zzzprojects/findandreplace on command line, so we can automate this step:
"fnr.exe" --cl --dir "SmartFormat.ZString\repo\src\ZString" --fileMask "*.cs,*.tt" --includeSubDirectories --caseSensitive --useRegEx --find "public (?=.*(class |struct |enum |interface |delegate ))" --replace "internal "

* Add a unit test to get an alert when Cysharp.Text objects are public

* Bump version to v3.3.2

Bump version to v3.3.1 (axuno#371)

* Bump version to v3.3.1
* Update README.md

Bump version to v3.3.0 (axuno#356)

Resolves axuno#345 (axuno#346)

* Resolves axuno#345

* PluralLocalizationFormatter does treat numeric string as valid argument
* Restore behavior of v3.1.0 and before (don't convert numeric string to decimal for arg values)
* Bump version to v3.2.2
* Update appveyor and github CI scripts

Fix: Auto-detection of PluralLocalizationFormatter does not throw for…

… values not convertible to decimal (axuno#330)

* Resolves axuno#329

Current behavior, introduced in v3.2.0:
When PluralLocalizationFormatter.CanAutoDetect == true, values not convertible to decimal will throw then trying to IConvertible.ToDecimal(...)

New behavior:
When PluralLocalizationFormatter.CanAutoDetect == true, for values not convertible to decimal, IFormatter.TryEvaluateFormat(...) will return false

* Make PluralLocalizationFormatter.TryGetDecimalValue static

Bump version to v3.2.0 (axuno#315)

Bump version to v3.1.0 (axuno#285)

Bumped version to v3.0.0