Allow plugin to define default font size, toolbar height and option to display/hide plan view selector.

- Shot Interval in Survey
- Much change to time/distance calc

This makes text show up better on map images

Shows horizontal/vertical scroll indicators

Sony a6000 ILCE-6000 with 16mm lens.
Source : 
http://www.sony.co.uk/electronics/interchangeable-lens-cameras/ilce-6000-body-kit#product_details_default

it's not a typical APS-C sensor, proper size gives more accurate
calculations.

The 22mm as stated on the lens is actual, not 35mm equvalent as on smaller
cameras.  - So it was wrong to reverse calculate for crop factor.

(the name was already the longes one)

Also change Plan Element selection ui

- GeoFence support comes from plugin
- Circle fence support
- Better param support