[Kernel] Implement GetThreadID, stub DuplicateHandle

include/kernel/kernel.hpp

@@ -90,6 +90,7 @@ class Kernel {
 	void createEvent();
 	void createThread();
 	void controlMemory();
+	void duplicateHandle();
 	void mapMemoryBlock();
 	void queryMemory();
 	void getProcessInfo();
@@ -97,6 +98,7 @@ class Kernel {
 	void getResourceLimitLimitValues();
 	void getResourceLimitCurrentValues();
 	void getSystemTick();
+	void getThreadID();
 	void sendSyncRequest();
 	void svcCloseHandle();
 	void connectToPort();

include/kernel/kernel_types.hpp

@@ -102,9 +102,11 @@ struct Thread {
     u32 initialSP;  // Initial r13 value
     u32 entrypoint; // Initial r15 value
     u32 priority;
+    u32 arg;
     s32 processorID;
     ThreadStatus status;
     Handle handle;  // OS handle for this thread
+    int index; // Index of the thread. 0 for the first thread, 1 for the second, and so on
  
     // The waiting address for threads that are waiting on an AddressArbiter
     u32 waitingAddress;