Restructure project to have Gradle stuff in a sub-folder

With the next release of Yarner that includes path modifications for file copying (yarner/issues/#27):

  • Move Gradle wrapper and scripts to a sub-folder, e.g. gradle-wrapper.
  • Change Yarner Version in the CI.
  • Change image in CI script as gradle wrapper can now be used (@reichold right?)
Edited by Martin Lange
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