Added a Float Converter Dialogue (Help -> Float Converter)

Converts Big-Endian bytes to floats and vise-a-versa.
Supports negative/positive floats. Supports 11 and 8 character hex strings (with and without spaces, ie: 20 00 00 00 and 20000000 work)
![Screenshot](https://f.cloud.github.com/assets/955414/1917996/3a106d4a-7daf-11e3-929f-df503bf0ee69.png)