Enhanced NativeBootstrap to support optional Authenticode signature validation and custom certificate validators when loading native libraries. Added 'NativeRequireSigned' configuration to app.config and resources, allowing signature enforcement to be toggled. Updated Program.cs to use the new option during initialization.
Introduces JsCore for ChakraCore P/Invoke, JsSerializer for JSON utilities via JS, and NativeBootstrap for robust native DLL loading. Updates Program.cs to initialize native dependencies at startup and registers new source files in the project file.
