spring-singlethreaded --> spring-legacy

Conflicts:

	rts/builds/multithreaded/CMakeLists.txt
fix EngineTypeHandler

Conflicts:

	rts/System/VersionGenerated.h.template
Fix bug in 153123a
CONFIG(DisableDemoVersionCheck)
[MT] Mutexify camera due to crash
[MT] Deadlock fix InMapDrawModel
fix #3612 (win32 log output eats CPU)
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