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Refactor ScalaTargetType/ScalaTarget
The refactor in this commit is driven by the work in the subsequent commit for issue scalacenter#659 (creating a Scaladex badge that supplies concise info on supported Scala versions). The key word there is 'concise' - given the many Scala artifacts that can be published for a single artifact version (the matrix of Scala language version, the platform - Scala JS/Native/SBT - and the platform version), achieving a concise summary requires a lot of grouping by those properties. Grouping by Scala `LanguageVersion` was easy enough, but grouping by platform & platform version was harder, as there wasn't any existing class to represent that. Consequently, I introduced the concept of a 'platform edition' (eg 'Scala JS 0.6', or 'Scala Native 0.4'), which is composed of two values: * targetType (Scala JS, Scala Native, or SBT) * platform version (eg the version '0.6' or '1.0' of Scala JS) ...this is like a `ScalaTarget`, but without the Scala Language version that `ScalaTarget` includes (eg a `ScalaTarget` is specifically compiled for, eg, _Scala 2.11_ on Scala JS 0.6). Having introduced the concept of `PlatformEdition`, it made sense to redefine relevant `ScalaTarget`s in terms of that - to do this meant moving several ad-hoc methods from the companion objects of `ScalaTarget` implementations (ie `ScalaJs`, `ScalaNative`, `SbtPlugin`) to the corresponding `ScalaTargetType` implementations and making them more widely available, by declaring them in the new `PlatformVersionedTargetType` trait, removing duplication for this existing code: * producing a String `render` value for platform names * checking validity of platform versions. As result most of the `ScalaTarget` companion objects were now empty and could be deleted. Another smaller change was prompted by the upcoming need to identify a `ScalaTargetType` by name (when the user specifies it as a query string parameter). To do that, you need a full list of `ScalaTargetType`s, and then you can also use that list to create an `Ordering[ScalaTargetType]` Also tidied up various tests that were creating their own platform version constants (as I was already moving equivalent constants from `ScalaTarget` companion objects to `ScalaTargetType` objects)
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