Debug HW for messuring electronics

[BigGold1310]

FIX the wrong power consumption measurement

• [x] Circuit analysis of electronic construction
• [x] Redimension hardware to get stable, useable signal on Measurement-Resistor
• [x] Comission ADC+Eval Board: System measures Current consumption correct.
• [x] Test hardware on air conditioner
• [x] Finish Documentation on Debugging Hardware

[codebru]

@joelvonrotz @BigGold1310 by the comments I assume this is done and will close.