renderer_vulkan: Rewrite descriptor set management and various small fixes (#77)

* renderer_vulkan: Remove vulkan prefix in SetObjectName

* renderer_vulkan: Rename renderpass cache to render manager

* It is no longer just a cache

* renderer_vulkan: Rewrite descriptor management

* Switch to batched vkUpdateDescriptorSets from cached descriptor sets with templates

* vk_master_semaphore: Remove waitable atomic

* These are buggy on some platforms and regular condition_variables are faster most of the time

* vk_texture_runtime.cpp: remove outdated references

* vk_render_manager: Minor cleanups and rename to RenderManager

* It is no longer just a renderpass cache
* Revert variable name change from render_manager back to renderpass_cache

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Co-authored-by: GPUCode <geoster3d@gmail.com>

src/video_core/custom_textures/custom_tex_manager.cpp

@@ -385,7 +385,7 @@ std::vector<FileUtil::FSTEntry> CustomTexManager::GetTextures(u64 title_id) {
 }
 
 void CustomTexManager::CreateWorkers() {
-    const std::size_t num_workers = std::max(std::thread::hardware_concurrency(), 2U) - 1;
+    const std::size_t num_workers = std::max(std::thread::hardware_concurrency(), 2U) >> 1;
     workers = std::make_unique<Common::ThreadWorker>(num_workers, "Custom textures");
 }