Add engine build cleaning command.#229

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JDuchniewicz wants to merge 2 commits intoPolyEngineTeam:devfrom

JDuchniewicz:cleancommandPython

Commits on Apr 15, 2020

Add engine build cleaning command.
JDuchniewicz
committed

Commits on May 28, 2020

Add game cleaning command. Add printing of messages.
JDuchniewicz
committed