gui: update text_test to use global function
spectrometer test: space
util: update runtest to new odemis.conf

Rely less on odemis.conf, and just expect to run from the odemis source directory
gui: rename real to phy
gui: move phy <-> world conersion functions to dblmsccanvas

canvas knows nothing about physical world, so no need to put function there
gui range slider: change cursor when moving window

use the same as when dragging canvas: a closed hand
gui: refactor toolbar

simplify toolbar class to just have one implementation, which supports any tool.

It has only one public method: AddTool()
The tab controller is in charge of calling the class with the right tools at init.

Also link the "fit zoom to content" functionality

still needs a bit of update on the XRC file

It would be even better if we could get rid completely of the XRC based children of the panel,
then the code could be simplified further.