Camlex 5.4 release: switch to MIT license

Hello Sharepoint developers who use Camlex in the work. I'm glad to announce that starting with version 5.4 Camlex will use MIT license. Before that Camlex was distributed under Ms-Pl license but nowdays MIT became standard for open source projects as most permissive license (e.g. PnP.Framework also uses MIT license). In order to be inline with the trend I changed Camlex license to MIT. New nuget packages with 5.4 version for basic object model version and CSOM version are already available for download.