Update csproj for v1.0.0 stable (icsharpcode#259)

Update ICSharpCode.SharpZipLib.csproj (icsharpcode#256)

Merge PR icsharpcode#247, Update Nuget package for v1.0-rc1

* Remove Directory.build.props
* Move Nuget settings to .csproj and update versions
* Fix repository URL, license URL and update copyright year.

Version 0.86.0

Version 0.85.5

Version 0.85.4

Version 0.85.3

Version 0.85.2

Version 0.85.1

Version 0.85.0