Many more features and a lot of code refactoring

Support for default User settings via a Parameter Screen
Support to Edit items in WizardUI
Support for Validators in WizardUI
Support to open SPK/Package Folders by Drag&Drop on Mods
Support to open SPK via Windows Explorer's context menu
Support to edit Package's dependencies (install_dep, install_conflict, install_break, ...)
Support to add ChangeLogs & Screenshot to be used by SSPKS
Support for Shortcuts on most menus
Support to edit admin's protocol, port and url
Use RecycleBin for important delete
CleanUp bin/obj/references/NuGetPackages
Various deep refactoring of the code