[CMake] find_package Module/Config mode and nontrivial package version checks

[Joachim Wuttke]

> Module mode is only selected if there is a Find<PakcageName>.cmake
> file available.  Otherwise Config mode is used anyway.  For a given
> project's call only one of the modes can be used: the find module
> is either present or it is not.  If the find module is available
> it is used and becomes responsible for enforcing the version check.
> Many of CMake's upstream find modules now support that.

Thank you, Brad.

Find modules are written in so many different styles that it is
difficult to choose the right one as template. Could you possibly
indicate one or two find modules that represent current best
practice?

- Joachim

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