Added empty DartVS.Common project.

This is to house things that are shared across all projects.
Moved StdIOService to Common.
Removed some DanTup prefixes from assembly info.
Moved some common AssemblyInfo strings to SharedAssemblyInfo.
Product name/desc tweaks (remove DanTup's).
Merge pull request #80 from DanTup/project-refactor

Created a "Common" project for shared classes; AssemblyInfo tweaks.