Vulkan: Move thirdparty code out of drivers, style fixes

- `vk_enum_string_helper.h` is a generated file taken from the SDK
  (Vulkan-ValidationLayers).
- `vk_mem_alloc.h` is a library from GPUOpen:
  https://github.com/GPUOpen-LibrariesAndSDKs/VulkanMemoryAllocator

servers/visual/rasterizer_rd/shaders/cubemap_roughness.glsl

@@ -36,7 +36,8 @@ layout(push_constant, binding = 1, std430) uniform Params {
 	uint sample_count;
 	float roughness;
 	bool use_direct_write;
-} params;
+}
+params;
 
 layout(location = 0) in vec2 uv_interp;