There are many MVKCommand subclasses that simply encode a single value,
resulting in loads of repetitive copy-pasted code.
- Add abstract template superclass MVKSingleValueCommand
for these concrete command classes.
- Modify MVKCmdSetBlendConstants to hold an MVKColor32 so it can
subclass from MVKSingleValueCommand, and modify MVKGraphicsPipeline
and MVKRenderingCommandEncoderState to use MVKColor32.
- Remove trivial comments for simple concrete Vulkan command classes.
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