Basemark GPU

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- Altered workload. Crystals in the medium workload now receive lights.
- Many tweaks here and there for the shaders.
- Vulkan barriers improved. No more ALL_COMMANDS_BIT barriers.
- Vulkan assumes memory is not coherent and does manual flushes.
- Vulkan memory allocator can handle heap fragmentation.
- Fixed some validation errors that were shown by later versions of vulkan sdk.
- Minor improvements in the OpenGL rendering path.