Remove resources and add culture initialiser for test projects

[mdabros]

This should fix issue #34, and fix the current issue with azure dev ops pipelines.

This adds an AssemblyInitializeCultureTest class for all unit test project, which sets the culture settings to CultureInfo.InvariantCulture. This should make the unit tests pass on machines with different culture settings.

    [TestClass]
    public class AssemblyInitializeCultureTest
    {
        [AssemblyInitialize]
        public static void AssemblyInitializeCultureTest_InvariantCulture(TestContext c)
        {
            CultureInfo culture = CultureInfo.InvariantCulture;
            CultureInfo.DefaultThreadCurrentCulture = culture;
            CultureInfo.DefaultThreadCurrentUICulture = culture;
            Thread.CurrentThread.CurrentCulture = culture;
            Thread.CurrentThread.CurrentUICulture = culture;
        }
    }

This pull request also removes the use of resources in all test projects, and instead uses a DataSetUtilities class to handle small test datasets. This also cleans up a lot of CsvParser code for loading the data.

[mdabros]

SharpLearning-CI-Build is the new CI build using the proper .net core pipeline in azure dev ops.