Simdify Platform

Updated the Simdify runtime to exclusively use the <GpuUniformBufferBind> to allocate memory on the GPU. Previously, it was not always clear when allocations were performed. At present the <GpuShaderBuffer> and <GpuUniformBuffer> nodes will create a buffer on the GPU, but will not allocate any memory. Allocations will only be performed by <GpuShaderBufferBind> and <GpuUniformBufferBind> nodes, according to the buffer size specified by the nodes. In the case of <GpuShaderBuffer> and <GpuShaderBufferBind>, sizing information from both the nodes is used to determine the total allocation.