Fixes the following error in the D3D12 debug layer:

D3D12 ERROR: ID3D12DescriptorHeap::GetGPUDescriptorHandleForHeapStart:
GetGPUDescriptorHandleForHeapStart is invalid to call on a descriptor
heap that does not have DESCRIPTOR_HEAP_FLAG_SHADER_VISIBLE set.
If the heap is not supposed to be shader visible, then
GetCPUDescriptorHandleForHeapStart would be the appropriate method
to call. That call is valid both for shader visible and non shader
visible descriptor heaps.
[ STATE_GETTING ERROR #1315: DESCRIPTOR_HEAP_NOT_SHADER_VISIBLE]

The benefit to exposing this over the raw BP state is that adjustments Dolphin makes, such as LOD biases from arbitrary mipmap detection, will work properly.

SPDX standardizes how source code conveys its copyright and licensing
information. See https://spdx.github.io/spdx-spec/1-rationale/ . SPDX
tags are adopted in many large projects, including things like the Linux
kernel.

Converts lingering panic alert calls over to the fmt-capable ones.

Migrates the logging over to the fmt-capable logger.