Support radix

[raczben]

Feature request - full radix support

Subtasks:

• Convert bynary to any radix (hex, fixed-pint, floating point, double, any other?, enums?, Labels?)
• Show proper format in all places (values col, bus signals, other?)
• Use it in analog waveform
• Add user-interface to select the radix for each lines

[cmarqu]

For analog waveforms, it would be nice to separate e.g. traces that carry voltage information from those that carry current information. These usually need to the scaled differently, and it would be nice if these "domains" could be distinguished by e.g. their background color.