Visualization Improvements 05/10/15

[ikeough]

Purpose

This PR adds additional improvements to the visualization pipeline using Helix 3D.

• Includes Helix3D update which references SharpDX 2.6.3 which should be tested as a fix for D3DCOMPILE_44.dll is missing #4367, Crash when starting 0.8.1.20150416T2058 in sandbox and Revit addin modes #4264, and 0.81xx daily builds nothing visible #4189
• Updates Helix 3D to include @pboyer's fix for MAGN-7291. This is fixed in Helix3D
• Increases point size as requested in MAGN-7441
• Updates Helix to include shader-level support for selection bit flipping. This is not enabled in Dynamo yet.

Declarations

Check these if you believe they are true

• The code base is in a better state after this PR
• The level of testing this PR includes is appropriate
  • No new tests added.

Reviewers

@pboyer

FYIs

@jnealb

[pboyer]

Let's add some explanation here.

[pboyer]

Just a few comments here. Once you've made the changes and the builds pass then LGTM.