Update and extend Buildinfo functionality

Marcus Mohrrequested to merge
mohr/buildinfo into master

The MR has two main aspects:

  1. Place the free-functions inside BuildInfo.hpp and Git.hpp into the new namespace hyteg::buildinfo. This is similar to the approach in waLBerla.
  2. Add a new query function fpType() which hands back a string representing the type that is behind real_t. This info is then used in printBuildInfo() and printSoftwareMetaData().

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