Modernize Thread

- Based on C++11's `thread` and `thread_local`
- No more need to allocate-deallocate or check for null
- No pointer anymore, just a member variable
- Platform-specific implementations no longer needed (except for the few cases of non-portable functions)
- Simpler for `NO_THREADS`
- Thread ids are now the same across platforms (main is 1; others follow)

2 files changed, 5 insertions, 9 deletions

diff --git a/core/debugger/remote_debugger_peer.cpp b/core/debugger/remote_debugger_peer.cpp
index 2e388d5934..857e3af268 100644
--- a/core/debugger/remote_debugger_peer.cpp
+++ b/core/debugger/remote_debugger_peer.cpp
@@ -65,12 +65,8 @@ int RemoteDebuggerPeerTCP::get_max_message_size() const {
 }
 
 void RemoteDebuggerPeerTCP::close() {
-	if (thread) {
-		running = false;
-		Thread::wait_to_finish(thread);
-		memdelete(thread);
-		thread = nullptr;
-	}
+	running = false;
+	thread.wait_to_finish();
 	tcp_client->disconnect_from_host();
 	out_buf.resize(0);
 	in_buf.resize(0);
@@ -85,7 +81,7 @@ RemoteDebuggerPeerTCP::RemoteDebuggerPeerTCP(Ref<StreamPeerTCP> p_tcp) {
 		connected = true;
 #ifndef NO_THREADS
 		running = true;
-		thread = Thread::create(_thread_func, this);
+		thread.start(_thread_func, this);
 #endif
 	} else {
 		tcp_client.instance();
@@ -188,7 +184,7 @@ Error RemoteDebuggerPeerTCP::connect_to_host(const String &p_host, uint16_t p_po
 	connected = true;
 #ifndef NO_THREADS
 	running = true;
-	thread = Thread::create(_thread_func, this);
+	thread.start(_thread_func, this);
 #endif
 	return OK;
 }
diff --git a/core/debugger/remote_debugger_peer.h b/core/debugger/remote_debugger_peer.h
index c759c65568..652e2d9d20 100644
--- a/core/debugger/remote_debugger_peer.h
+++ b/core/debugger/remote_debugger_peer.h
@@ -58,7 +58,7 @@ class RemoteDebuggerPeerTCP : public RemoteDebuggerPeer {
 private:
 	Ref<StreamPeerTCP> tcp_client;
 	Mutex mutex;
-	Thread *thread = nullptr;
+	Thread thread;
 	List<Array> in_queue;
 	List<Array> out_queue;
 	int out_left = 0;