* project fix
* resolve a circular dependency with opc.ua.sample
* fix dependency on HeaderBranding
* Stack updates for GDS server, to handle app cert signing and crl creation for CA
* GDS server / client fixes.
Supports signing of certs, app registration/unregistration, cert revocation
Build fails until sql db files are manually created
2. Removed client cert validation from HTTPS client and server as this is not supported on all platforms, e.g. .Net4.6.
3. Reverted back to XmlDocument from XDocument as this is now supported via a NuGet package on UWP and XDocument is not supported on .Net4.6.
4. Baseline .Net4.6 samples and assoc. controls project check-in, not working yet.
5. Moved UWP client controls from SDK to Samples directly.
AlinMoldovean