Removed dependency on GitVersionTask

Removed GitVersionTask, switched to GitHub Actions (#15)

* Removed dependency on GitVersionTask

* Added GitHub Actions workflows

* Removed CircleCI config

* Updated README badge

Added logging support

Attach a logger using the new RegexBuilder.AddLogger() API to peep under the hood and see how your regex is being built, step by step.

Fix for AnyCharacterFrom()

Fixed bug in AnyCharacterFrom() so it works as documented

Support for Unicode letters

The following RegexBuilder methods now support Unicode letters:

• Letter()
• NonLetter()
• UppercaseLetter()
• LowercaseLetter()
• LetterOrDigit()
• NonLetterOrDigit()
• WordCharacter()
• NonWordCharacter()

Switched target from .NET Core to .NET Standard

v1.1.0 had a dependency on .NET Core. This has now been switched to .NET Standard so the library can be used in both .NET Core and .NET Framework projects.

Minor new features

• New whitespace element methods: Space(), Tab(), LineFeed(), CarriageReturn(), PossibleWhitespace()
• AnyOf() now takes variable parameters
• Deprecated RegexQuantifier.NoneOrOne, replaced with ZeroOrOne

Maintenance release

Another maintenance release while getting CI/CD working across all RegexToolbox projects.

Maintenance release

There are no new features in this release. It's just a maintenance release following some CI/CD work.