Transfer time deltas, not absolute times.

This change significantly reduces network bandwidth requirements.

Implemented for:
- CPU zones,
- GPU zones,
- locks,
- plots,
- memory events.

client/TracyProfiler.hpp

@@ -543,6 +543,8 @@ private:
     std::atomic<uint32_t> m_zoneId;
 
     uint64_t m_threadCtx;
+    int64_t m_refTimeThread;
+    int64_t m_refTimeSerial;
 
     void* m_stream;     // LZ4_stream_t*
     char* m_buffer;