gui: Canvas tweak and module documentation update
gui: Canvas images are no longer updated while being dragged
gui: Added dummy test case for rapid Cairo drawn canvas prototyping
gui: finished cairo rendering sandbox test
gui: Migration to Cairo *WIP*
gui: Migration to Cairo *WIP*
gui: Updated canvas testcases
gui: Overlay fixes for Cairo rendering
gui: Image presence check and metadata fix
gui: Fixed merge ratio bug
gui: DataArray byte swap optimalisation
gui: Fixed PNG to DataArray conversion for the calibration image:
Merge branch 'master' into cairo_render
gui: Canvas testcase *WIP*
Merge branch 'master' into cairo_render
model: Fixed bug that made copied DataArrays share the same meta data dictionary
gui: Cairo test cases *WIP*
gui: Fixed translation bug on large scaled canvas view
gui: Cairo test *WIP*
gui: Cairo scaling and position fix