[Vulkan] Optional functionality usage improvements

Functional changes:
- Enable only actually used features, as drivers may take more optimal
  paths when certain features are disabled.
- Support VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE.
- Fix the separateStencilMaskRef check doing the opposite.
- Support shaderRoundingModeRTEFloat32.
- Fix vkGetDeviceBufferMemoryRequirements pointer not passed to the Vulkan
  Memory Allocator.

Stylistic changes:
- Move all device extensions, properties and features to one structure,
  especially simplifying portability subset feature checks, and also making
  it easier to request new extension functionality in the future.
- Remove extension suffixes from usage of promoted extensions.

src/xenia/ui/vulkan/vulkan_upload_buffer_pool.cc

@@ -138,13 +138,13 @@ VulkanUploadBufferPool::CreatePageImplementation() {
   memory_allocate_info.pNext = nullptr;
   memory_allocate_info.allocationSize = allocation_size_;
   memory_allocate_info.memoryTypeIndex = memory_type_;
-  VkMemoryDedicatedAllocateInfoKHR memory_dedicated_allocate_info;
-  if (provider_.device_extensions().khr_dedicated_allocation) {
+  VkMemoryDedicatedAllocateInfo memory_dedicated_allocate_info;
+  if (provider_.device_info().ext_1_1_VK_KHR_dedicated_allocation) {
     memory_allocate_info_last->pNext = &memory_dedicated_allocate_info;
     memory_allocate_info_last = reinterpret_cast<VkMemoryAllocateInfo*>(
         &memory_dedicated_allocate_info);
     memory_dedicated_allocate_info.sType =
-        VK_STRUCTURE_TYPE_MEMORY_DEDICATED_ALLOCATE_INFO_KHR;
+        VK_STRUCTURE_TYPE_MEMORY_DEDICATED_ALLOCATE_INFO;
     memory_dedicated_allocate_info.pNext = nullptr;
     memory_dedicated_allocate_info.image = VK_NULL_HANDLE;
     memory_dedicated_allocate_info.buffer = buffer;