[ADDED] Dynamic descriptors

[siystar]

Description

Added dynamic descriptor buffer support for buffering of per frame data as used for example in vsg::ViewDependentState

Type of change

• [ X]New feature (non-breaking change which adds functionality)

How Has This Been Tested?

• vsgExamples/vsglights
• various descriptor buffers in our application

Checklist:

• [X ] My code follows the style guidelines of this project
• [ X] I have performed a self-review of my own code
• [ X] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [X ] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [X ] New and existing unit tests pass locally with my changes
• [X ] Any dependent changes have been merged and published in downstream modules

[robertosfield]

How close will this PR be to the existing BufferedDescriptorSet branch?

[robertosfield]

I have create a branch with these changes: siystar-dynamicdescriptors

I'll do a light review today but as this a significant change expect it'll take a day or so to wrap things up.

[robertosfield]

Arrrrrr, just typed in two paragraphs then went to look up a class and github losts all my text. Soo bloody frustrating when I'm having to type/use mouse my just my left hand.

Basic just is I'm still getting to know the changes in this PR. It's slow going because fricken broken wrist/arm. My current line I'm pondering on is whether we meed a dedicated vsg::BindDynamicDescriptorSet class, perhaps just integrating support for the pDynamicOffsets array should be done automatically be the existing vsg::BindDescriptorSet/BindDescriptorSets classes.

Thoughts?

[robertosfield]

I am now closing this PR as the functionality is now provided using the new dynamic data functionality.