logic: update Visual Studio plugin to support Visual Studio 2017

* changed description text of Visual Studio plugin
* changed plugin install targets to include VS 2017
* add license file with MIT license
* updated vsix for deployment

* implement wrapper for all used classes of VCProjectEngine.dll since you cannot just use the oldest version of this
  assembly (see https://stackoverflow.com/questions/44288050/typecast-fails-when-visual-studio-extension-uses-reference-to-older-assembly).
* improved serialization and deserialization of compile commands and compilation databases.
* updated used JSON package
* rename CommandObject to CompileCommand
* changed implementation to keep non-existent file paths in cdb
* made methods of SolutionParser non-static
* replace spaces with tabs

* added IntegrationTests project
* configured tests to simulate a new instance of VisualStudio
* added cinder as test project for integration tests
* remove all absolute paths from expected output of integration tests

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ide_plugins/vs/vs2015/SourcetrailPlugin/VCProjectEngineWrapperFactories/VCFileWrapperFactory.cs

@@ -0,0 +1,27 @@
+namespace VCProjectEngineWrapper
+{
+	public static class VCFileWrapperFactory
+	{
+		public static IVCFileWrapper create(object wrapped)
+		{
+			IVCFileWrapper wrapper = null;
+
+			wrapper = new VCFileWrapperVs2017(wrapped);
+
+			if (wrapper == null || !wrapper.isValid())
+			{
+				wrapper = new VCFileWrapperVs2015(wrapped);
+			}
+			if (wrapper == null || !wrapper.isValid())
+			{
+				wrapper = new VCFileWrapperVs2013(wrapped);
+			}
+			if (wrapper == null || !wrapper.isValid())
+			{
+				wrapper = new VCFileWrapperVs2012(wrapped);
+			}
+
+			return wrapper;
+		}
+	}
+}