gui: Focus overlay margin fix
gui: Fixed SEM pixel size setter so it cannot get out of range
gui: Fixed layout of scale window in lens alignment tab
gui: added dynamic unit assignement to plot legend and fixed MarkLineOverlay clearing bug
model: Continuous VA mixin update, so it handles 'vector' values of any length
gui: Polar overlay update wip
Merge branch 'master' of delmic-server.local:odemis