Added electric current units
Added electric resistance units
Added more prefixes for electric potential

- Millivolts and kilovolts are very commonly used. Microvolts are less common but still
	useful in certain situations.
Merge pull request #41 from bretthysuik/feature/electric-resistance

Feature: Electric resistance
Added megavolts
Added nano, micro, kilo, and mega ampere prefixes.
Fixed broken unit tests.
Added power units
Changed power base units type to decimal.
Added support for generating logarithmic units

- "Logarithmic" and "LogarithmicScalingFactor" are used in the json file to indicate the unit is logarithmic.
- Added a separate PowerShell script to generate the logarithmic arithmetic operator source code.
Added support for generating arithmetic operator unit tests for logarithmic units
Tweaks to logarithm PowerShell scripts

- Added documentation to logarithmic source code generator functions.
- Tweaked various comments and names.
- Inverted logic when checking if a unit is logarithmic so it's easier to read/understand.
Merge pull request #43 from bretthysuik/additional-voltage-prefixes

Added more prefixes for electric potential

Millivolts, kilovolts and megavolts
Merge pull request #42 from bretthysuik/feature/electrical-current

Feature: Electric current

From nano to megaamperes.
Removed auto-generation of logarithmic addition and subtraction unit tests

- The previous calculation is incorrect in certain situations. There's no way to define the expected value without re-implementing the addition/subtraction algorithm.
- Developers are now responsible for creating custom logarithmic addition and subtraction unit tests.
Merge pull request #44 from bretthysuik/feature/power

Feature: Power
Merge pull request #45 from bretthysuik/feature/logarithmic-units

Feature: Added support for generating logarithmic units
Added level units.

- Level is the logarithm of the ratio of a quantity Q to a reference value of that quantity, Q0.
- Level is expressed in two dimensionless units: decibels (dB) and nepers (Np).
- Level is a non-standard SI unit but its usage is accepted alongside SI.
Added power ratio units.

- Power ratio is the strength of a signal expressed in decibels (dB) relative to one watt.
- Power ratios are commonly used in audio, RF, and telecommunications engineering.
Merge pull request #47 from bretthysuik/feature/level

Feature: Level

    Level is the logarithm of the ratio of a quantity Q to a reference value of that quantity, Q0.
    Level is expressed in two dimensionless units: decibels (dB) and nepers (Np).
    Level is a non-standard SI unit but its usage is accepted alongside SI.