Add floating point numbers support to 'convert numbers to words' functionality.

[sxmawl]

Currently, if someone tries to convert a floating point number into words, the output comes as error: invalid number.
People often deal with 12-15 digit floating point numbers which are more than painful to comprehend at a glance, so it might be a good idea to add support for this.

Screenshot:

[knadh]

Makes sense! Would you like to send a PR for this?

[sxmawl]

Yes, sure.