Implement Numeric Precision Rounding

[jordanrobot]

The user preferences includes a precision rounding value. Please implement this so that it displays all values as having a maximum number of decimals the user indicates, across the entire application.

• This will not force all values to have this number of decimal numbers. E.g. if the number is 12, it will not be forced to read as 12.00.
• This will only truncate long decimal numbers, such as shortening 12.456789 to 12.46 if the user has specified 2 significant digits.

This should not apply to the following value:

• Rotor Inertia

This should only affect the visual display of the numbers, not the data itself; this rounding must not get saved back into the motor definition file and mess up the source data.