Implement feature: width and height scaling to auto fill, or partially fill screen

[Dmytro-Shulha]

User should be able to set width and height scaling.

For each plot individually, I believe it is possible to do via layout or config properties of each plot.

For all plots, the ability to set global default values will be implemented in #4

Also, in case abovementioned options won't be sufficient, then possibility to provide additional scaling options should be investigated.