Create RenderTest to load truth cube data and display them for all strains.
Revise RenderTest for Truth Cube.

1. Add origial uniaxial_positions.csv dataset for the test.
2. Use ApplicationData to load data file.
3. Rename the render test to TruthCubeRenderTest.
Revise TruthCubeRenderTest.

+ Add common RenderTest class to SetUp() and TearDown() rendering environment.
+ Inherite TruthCubeRenderTest from RenderTest and update the code.
+ Add doInitialize() runTest() to loading and run truth cube render test
Revise and clean up truth cube render test.

+ Using #include "..." format for the code.
+ Moving ParseTruthCubeData into TruthCubeRenderTest struct.
+ Remove extra namespace of math vector3d.
Delete comments on TruthCube dataset in RenderTest.
Correct function name of parseTruthCubeData using lower case for 1st character.
Fix calling method of parseTruthCubeData() to remove the broken build.
Add curly braces to while loop statement.
Updata index space of return statement.
Fix single statement definition for variable index in TruthCubeRenderTest.
Merge branch 'master' of git.assembla.com:OpenSurgSim into feature/truthcube-test
Merge branch 'feature/truthcube-test' into 'master'

Create a render test to load and display truth cube data for all strains

Merged-on: https://www.assembla.com/code/OpenSurgSim/git/merge_requests/600063