Decouple source code retrieval from the profiler thread.

This will prevent apparent freezes of the profiler when debuginfod queries are
made.

public/common/TracyProtocol.hpp

@@ -9,7 +9,7 @@ namespace tracy
 
 constexpr unsigned Lz4CompressBound( unsigned isize ) { return isize + ( isize / 255 ) + 16; }
 
-enum : uint32_t { ProtocolVersion = 61 };
+enum : uint32_t { ProtocolVersion = 62 };
 enum : uint16_t { BroadcastVersion = 3 };
 
 using lz4sz_t = uint32_t;