D23103: Add decibel power units (dBW and multiples)

[Ismael Asensio]

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REVISION SUMMARY
  Add decibel power units (dBW and mulitples)
  
  Decibel power units are widely used in the fields of signal trasnmission and radiofrequency. 
  This patch adds decibel units to the Power category (dBm, dbW, dBµW and dBk).
  
  The decibel calculation might be also interesting to other categories such as voltage or pressure (acoustics)

TEST PLAN
  - Check the units of the power category on krunner
  - The reference unit: 1W = 0dBW = 30dBm = 60dBµW = -30dBk
  - The decibel is a logarithmic scale so multiplying on natural units implies addition in decibel units:
  
  10W = 10dBW = 40dBm = 70dBµW = -20dBk

REPOSITORY
  R292 KUnitConversion

BRANCH
  log_power_units

REVISION DETAIL
  https://phabricator.kde.org/D23103

AFFECTED FILES
  src/power.cpp
  src/unit.h

To: iasensio
Cc: kde-frameworks-devel, LeGast00n, michaelh, ngraham, bruns
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