[FEATURE] Provide TypoScript configuration for Fluid templates

[eliashaeussler]

This PR introduces a global TypoScript configuration that allows to override Fluid templates used in EXT:warming. The following TypoScript constants are now available:

module.tx_warming {
  view {
    # cat=warming/view/10; type=string; label=Path to template root
    templateRootPath =
    # cat=warming/view/20; type=string; label=Path to template partials
    partialRootPath =
  }
}

Related: #174

[codeclimate]

Code Climate has analyzed commit 0a564da and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 96.6%.

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