Rename of vsg::UniformBinding to vsg::DescriptorBinding and associated method renaming/deprecation

[robertosfield]

Hi All,

I have just merged changes to VSG master that renames vsg::UniformBinding to vsg::DescriptorBinding and also renames a collection of enableUniform(..)/assignUniform(..) methods in vsg;;DescriptorConfiguration and vsg::GraphicsPipelineConfigurator to enbleDesciptor/enableDescriptor(..). The original methods have been [[deprecated]] so you'll now get warnings to rename them when you build against VSG master or the next stable release 1.0.10.

The changes to the VSG are:

#963

The deprecated methods were used in vsgXchange, vsgPoints and vsgExamples so I have merged changes to them to update them to the lastest API. Changes are just renames of methods/classes so it's not a major task:

vsg-dev/vsgXchange#169
vsg-dev/vsgPoints#14
vsg-dev/vsgExamples#262

These changes were made to resolve some clumsy naming of class and methods which was highlighted when @theodoregoetz recently tried to use ShaderSet/GraphicsPipelineConfigurator with a DescruptorBuffer set up as storage buffer type rather than a uniform buffer. type that these classes had been designed around. The new naming is more general purpose.

Thanks to @theodoregoetz helping out with these changes and making fixes to the storage buffer support.

[theodoregoetz]

I noticed that this PR renames the vsg::UniformBinding struct and vsg::ShaderSet::uniformBindings public member without providing a deprecated symbol. You may consider adding these back in to ShaderSet.h:

class ShaderSet {
        std::vector<DescriptorBinding>& uniformBindings = descriptorBindings;
}

using UniformBinding = DescriptorBinding;

[robertosfield]

I didn't add it because I didn't hit any compatibility issues with it not being defined. If there is an issue with compatibility then I'll add it, but will avoid unless we actually need it.