Converter integration with Calculator

I've integrated the Converter with the Calculator to allow passing values between them.  This allows for entry and editing of values in standard scientific notation (ex: 1.234E18 [1.234 x 10^18]) and for performing calculations on values in the Calculator and passing them back into the Converter.

For example, suppose you have the following conversion from light years to meters:

You can then change the light-years value by first swapping the units (touch either "From" or "To"):

Then touch the [Calculator] button to send the light-years value to the Calculator:

Perform a calculation on the value (ex: divide it by 1000):

You may then touch the result value in the display area to copy the value to the clipboard, touch the [Done] button, and paste the new value into the Converter's "From" value box:

A new conversion will be performed and the result will be displayed automatically:

This is of course a simplistic, contrived example.  Another use of the Calculator integration is to enter a number in scientific notation.  For example, you may touch the [Calculator] button, enter a new value, and touch it to copy to the clipboard, such as:

Touch [Done] to return to the Converter and paste the new value into the "From" value box.  This will automatically perform a new conversion:

More later ...