Adds lovable android unit and a corresponding spawner. They are OP.
Unit's and spawner's working_sound is made from combining two sounds from pixabay, four sound files in total were used.

Units

gear-spinning-loop, newagesoup (Freesound)
https://pixabay.com/sound-effects/film-special-effects-gear-spinning-loop-6981/

Mechanical Motor Starting – Whirring – Stopping, arunangshubanerjee
https://pixabay.com/sound-effects/film-special-effects-mechanical-motor-starting-whirring-stopping-330043/

Spawner

Grinding Gears and Steady Clinking.wav, Ted_Erski (Freesound)
https://pixabay.com/sound-effects/household-grinding-gears-and-steady-clinkingwav-14532/

Scifi_Generator_Lp, Euphrosyyn (Freesound)
https://pixabay.com/sound-effects/film-special-effects-scifi-generator-lp-29685/

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Free for use under Pixabay's Content License
https://pixabay.com/service/license-summary/

All above sound credits were copied from credits.txt