Restructor the entire project to take advantage of VS2017

[DavidArno]

• [x] Move the SuccincT and SuccincT.JSON projects to src and change them to use new csproj files and both to target .net standard 1.1
• [x] Create new build projects for SuccincT that target .net standard 1.45 and 1.6
• [x] Create new build projects for SuccincT.JSON that target .net standard 1.45 and 1.6
• [x] Create appropriate build project to generate all csproj files at build time from metadata
• [x] Create appropriate build project to generate nuget packages containing all target dlls at build time
• [x] Merge @megafinz's PR's into these new projects.
• [x] Merge everything back to master.

[DavidArno]

The master branch is now strictly VS2017-only. All tasks completed.