[Feature Request] Support SI RF units & conversions

[dBitech]

Add support for RF units, and conversion between them.

Such as: Vpeak = Peak Voltage of an AC signal. Vrms: [Vpeak/sqrt(2)] = Root Mean Square Voltage. uV: [Vrms * 10^-6] = RMS voltage in microvolts. uVemf: [((2*Vpeak)/sqrt(2))*10^-6] = Open Circuit voltage in microvolts . uVpd: [(Vpeak/sqrt(2))*10^-6] = Microvolt with load, When the signal has a matched load, 1/2 the voltage is dropped across the load. it is the same as uV, unit just explicitly defines as loaded voltage. dBuV: 20log(uV) = decibel of RMS microvolt. dBuVemf: 20log(uVemf) = decibel of emf (open circuit) microvolt. dBuVpd: 20log(uVpd) = decibel of loaded microvolt. dBm: 10log(mW) = Power measurement, decibel of power in mW dBuW: 10log(uW) = Power measurement, decibel of power in uW

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[df7cb]

RF units would be cool, but dBs don't fit into the current way it works (linear vs logarithmic scale). I'll see if I can think of a way to make it work.