This branch fixes copying to the clipboard in a couple of ways:
* Remove GTK / GDK specific code from core (Do.Core.Controller.cs)
* Add CopyToClipboard as a method of Services.Environment
* Put linux specific (GTK / GDK) clipboard related code inside of Do.Platform.Linux.EnvironmentService.cs
* Adds item checking to copy action
This branch fixes copying to the clipboard in a couple of ways:
* Remove GTK / GDK specific code from core (Do.Core. Controller. cs) Environment Linux.Environme ntService. cs
* Add CopyToClipboard as a method of Services.
* Put linux specific (GTK / GDK) clipboard related code inside of Do.Platform.
* Adds item checking to copy action