provide additional for representing floating-point numbers in debugger

I do very much appreciate being able to select between "Compact Float" and "Scientific Float" under "Change Value Display Format" within the "Local" pane in debugging mode.

It would sometimes be extremely useful to have an additional option that corresponds to the `std::hexfloat` representation.  Also helpful would be to break apart the floating point number into a normalized fraction and an integral power of two, via `std::frexp()`.