give an option for a toggle button on graphs to change y-axis min/max

For instance to toggle between:
- setting y-min and y-max to min and max value of the plot
- setting y-min and y-max to system provided min/max, such a `0,2^(bitdepth)` or `minval,maxval` for the Y graph
- allow user to set custom y-min and y-max