pybullet, more robust multi-server connections

Windows shared memory: allow to use custom key.
Improve GUI performance on Windows, submit letters in text as a batch (fewer draw-calls)
quadruped.py: first try to connect to SHARED_MEMORY, if it fails (<0) use GUI
increase Chrome about://tracing json export capacity (press 'p' in Example Browser)
UDP physics server: add --port and --sharedMemoryKey command-line arguments
PhysicsServerExample: add --sharedMemoryKey command-line option (for VR example too)
ExampleBrowser: sleep a few milliseconds if rendering is too fast, use --minUpdateTimeMicroSecs=0 to disable

examples/SharedMemory/main.cpp

@@ -72,6 +72,7 @@ int main(int argc, char* argv[])
 	CommonExampleOptions options(&noGfx);
 
 	args.GetCmdLineArgument("shared_memory_key", gSharedMemoryKey);
+	args.GetCmdLineArgument("sharedMemoryKey", gSharedMemoryKey);
 	
 // options.m_option |= PHYSICS_SERVER_ENABLE_COMMAND_LOGGING;
 // options.m_option |= PHYSICS_SERVER_REPLAY_FROM_COMMAND_LOG;