Replace yuzu identifiers with citron

Update magic numbers and default identifiers across codebase:
- UUID default value
- Thread magic number
- Amiibo name
- Vulkan cache magic number
- Shader cache magic number

src/common/uuid.h

@@ -82,7 +82,7 @@ struct UUID {
      */
     static constexpr UUID MakeDefault() {
         return UUID{
-            {'y', 'u', 'z', 'u', ' ', 'D', 'e', 'f', 'a', 'u', 'l', 't', ' ', 'U', 'I', 'D'},
+            {'c', 'i', 't', 'r', ' ', 'D', 'e', 'f', 'a', 'u', 'l', 't', ' ', 'U', 'I', 'D'},
         };
     }
 

src/core/hle/kernel/k_thread.h

@@ -656,7 +656,7 @@ public:
         void* native_context{};
         std::atomic<u32> lock{1};
         bool is_running{};
-        u32 magic{Common::MakeMagic('Y', 'U', 'Z', 'U')};
+        u32 magic{Common::MakeMagic('C', 'I', 'T', 'R')};
     };
 
     NativeExecutionParameters& GetNativeExecutionParameters() {

src/core/hle/service/nfc/common/device.cpp

@@ -1494,7 +1494,7 @@ void NfcDevice::BuildAmiiboWithoutKeys(NFP::NTAG215File& stubbed_tag_data,
     settings.write_date = GetAmiiboDate(GetCurrentPosixTime());
 
     // Register info
-    SetAmiiboName(settings, {'y', 'u', 'z', 'u', 'A', 'm', 'i', 'i', 'b', 'o'});
+    SetAmiiboName(settings, {'c', 'i', 't', 'r', 'A', 'm', 'i', 'i', 'b', 'o'});
     settings.settings.font_region.Assign(0);
     settings.init_date = GetAmiiboDate(GetCurrentPosixTime());
     store_data.BuildBase(Mii::Gender::Male);

src/video_core/renderer_vulkan/vk_pipeline_cache.cpp

@@ -54,7 +54,7 @@ using VideoCommon::GenericEnvironment;
 using VideoCommon::GraphicsEnvironment;
 
 constexpr u32 CACHE_VERSION = 11;
-constexpr std::array<char, 8> VULKAN_CACHE_MAGIC_NUMBER{'y', 'u', 'z', 'u', 'v', 'k', 'c', 'h'};
+constexpr std::array<char, 8> VULKAN_CACHE_MAGIC_NUMBER{'c', 'i', 't', 'r', 'v', 'k', 'c', 'h'};
 
 template <typename Container>
 auto MakeSpan(Container& container) {

src/video_core/shader_environment.cpp

@@ -25,7 +25,7 @@
 
 namespace VideoCommon {
 
-constexpr std::array<char, 8> MAGIC_NUMBER{'y', 'u', 'z', 'u', 'c', 'a', 'c', 'h'};
+constexpr std::array<char, 8> MAGIC_NUMBER{'c', 'i', 't', 'r', 'c', 'a', 'c', 'h'};
 
 constexpr size_t INST_SIZE = sizeof(u64);