Add support for logarithmic scale

[roym899]

Is your feature request related to a problem? Please describe.
Logarithmic scale is typically used to visualize data that varies a lot (same problem as described in #1732). This is a standard feature of most plotting libraries and I would expect the viewer to have support for this. It is also commonly used when monitoring losses for neural nets.

Describe the solution you'd like

• Add an option to switch between linear and logarthmic scale Y-axis (under View properties -> Scalar axis).

The X-axis is less obvious. Should the timeline support linear and log scales? Should changing the timeline affect the plots? Or should they be decoupled?

Describe alternatives you've considered
Current workaround is to log transformed scalars (this works for both x and y-axis). It'd be much more convenient to have a switch for this in the viewer though.