Sort out font/icon sizes on different resolutions

[richsmith]

Currently things like station labels are hard to read at different (very new) phone resolutions because they are set in pixels. These should scale more intelligently.

Dev Notes

Look into setting the size of things using something other than pixels, or doing the scaling in code.

[CaverBruce]

I could not find out how to increase the size of the scalebar and survey name text in the bottom left corner of the canvas. on Samsung s8 is far too small.