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

fortune cookie message = A stranger will bring great meaning to your life.

.gitignore

@@ -23,6 +23,17 @@
 
 /ide_plugins/vs/vs2015/SourcetrailPlugin/SourcetrailPlugin/bin
 /ide_plugins/vs/vs2015/SourcetrailPlugin/SourcetrailPlugin/obj
+/ide_plugins/vs/vs2015/SourcetrailPlugin/SourcetrailPlugin.IntegrationTests/bin/Debug
+/ide_plugins/vs/vs2015/SourcetrailPlugin/SourcetrailPlugin.IntegrationTests/bin/Release
+/ide_plugins/vs/vs2015/SourcetrailPlugin/SourcetrailPlugin.IntegrationTests/obj
+/ide_plugins/vs/vs2015/SourcetrailPlugin/TestResults
+
+/ide_plugins/vs/vs2015/SourcetrailPlugin/VCProjectEngineWrapperInterfaces/bin
+/ide_plugins/vs/vs2015/SourcetrailPlugin/VCProjectEngineWrapperInterfaces/obj
+/ide_plugins/vs/vs2015/SourcetrailPlugin/VCProjectEngineWrapper/bin
+/ide_plugins/vs/vs2015/SourcetrailPlugin/VCProjectEngineWrapper/obj
+/ide_plugins/vs/vs2015/SourcetrailPlugin/VCProjectEngineWrapperFactories/bin
+/ide_plugins/vs/vs2015/SourcetrailPlugin/VCProjectEngineWrapperFactories/obj
 
 *.coatidb
 *.srctrldb
@@ -33,6 +44,7 @@
 *.pch
 *.swp
 *.swo
+*.VC.db
 
 .clang_complete
 .ycm_extra_conf.py
@@ -50,4 +62,3 @@ Makefile
 /deployment/windows/wixSetup/CustomActions/UninstallRemoveLogFolder/obj
 /deployment/windows/wixSetup/Setup/build/Setup/Release
 /deployment/windows/wixSetup/Setup/build/Setup/x64
-/deployment/windows/wixSetup/Setup/build/Setup.VC.db