Fix ApplicationData using "config.txt" in Physics RenderTest and UnitTest
StaplingExample's ApplicationData use config file.
Merge branch 'fix/staplingexample-config' into 'master'

ApplicationData in StaplingExample all use the config file.

+1: Harald Scheirich

Merged-on: https://www.assembla.com/code/OpenSurgSim/git/merge_requests/894753
Merge branch 'fix/physicsRenderTestApplicationData' into 'master'

Fix ApplicationData using 'config.txt' in Physics Render/Unit Test

+1: haizhouW, Harald Scheirich

Merged-on: https://www.assembla.com/code/OpenSurgSim/git/merge_requests/891673