[FEAT] - Add a decimal separator key for numpad

[rpbarreira]

Is your feature request related to a problem? Please describe.

Not having the posibility on numpad to write numbers with decimal parts

Describe the solution you'd like

Allow the decimal separator char to be passed on the option "keysNumpadArrayOfNumbers" for the numpad keys.
If accepted, this name "keysNumpadArrayOfNumbers" should also change since the characters may be no longer just numbers.