upgrade of .NET to .NET Framework >= 4.5

Multicharts.NET has been around and proven a reliable alternative to EasyLanguage, empowering .NET developers to extend the core functionality.
Nonetheless, the core engine needs to be kept up to date with the .NET evolution, and once in a while, upgrade to a Framework release that is long term maintained & patched, and that makes common sense. And beyond anything else, to move forward from the old dusty 4.0 Framework that's been decades old in the works.
This would empower users to make good use of NuGet plugins & extensions, and use the latest Visual Studio Express editors.