Reworks the toplevel playlib module

This is the first commit of a redesign of the play lib module. The new
design was massively inspired from the `scalajslib` module.

It adds a specialized worker for each version of play, both workers
implement a common api from an `api`. The main module delegates to a
`loader` which dynamically looks up the bridge instance through
reflection then triggers the generation.

- adds a `RouteCompilerWorkerApi` trait which establishes the bridge to
the actual `RouteCompilerWorker`.
- drops the existing `RouterGeneratorWorker` (it is specialized by
versions of play and extracted to its own submodule).
- updates the `RouterModule` with improved settings and documentation.

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