(Since version 0.11.1) Use InputKey, which is a drop-in replacement.
(Since version 0.11.1) Use SettingKey, which is a drop-in replacement.
(Since version 0.11.1) Use TaskKey, which is a drop-in replacement.
The idea here is to be able to define a "sbtVersion in sbtPlugin" which directs the dependencies of the plugin to build to the specified sbt plugin version.
(Since version 0.12.0) Renamed to CommandStrings.
(Since version 0.13.0) Use Def.inputTask with the Def.spaceDelimited() parser.
(Since version 0.13.0) In build.sbt files, this call can be removed. In other cases, this can usually be replaced by Seq.
(Since version 0.13.0) Use string interpolation