minor cleanup / reordering of initialiser in Nativeui, also moved finding of localisation files to its own method

Moved sizing controls for battery display, tab_modeswitch, localisation button to ui_layout. Also added more explicite passthrough of intra-widget spacing parameter based on screen size so that it scales more easily

# Conflicts:
#   .gitlab-ci.yml

Updated data handler to tag plot data using cycle payloads, and limit the back data on circle plots to 3 cycles