* Update version to 2.3.0-beta

* Disable StaticWebAssets and Compression in multiple projects

StaticWebAssetsEnabled set to false in various project files, including:
- Authentication.Facebook.csproj
- Authentication.Google.csproj
- DiscountRules.Standard.csproj
- Payments.BrainTree.csproj
- Payments.CashOnDelivery.csproj
- Payments.StripeCheckout.csproj
- Shipping.ByWeight.csproj
- Shipping.FixedRateShipping.csproj
- Shipping.ShippingPoint.csproj
- Tax.CountryStateZip.csproj
- Tax.FixedRate.csproj
- Theme.Modern.csproj
- Widgets.FacebookPixel.csproj
- Widgets.GoogleAnalytics.csproj
- Widgets.Slider.csproj

CompressionEnabled set to false in:
- Grand.SharedUIResources.csproj
- Grand.Web.Admin.csproj
- Grand.Web.Vendor.csproj
- Grand.Web.csproj

* Braintree - Add CurrencyIsoCode to TransactionRequest

* Add ConfigurationManager and update StripeCheckout