Win32-Timer:
CHANGED: - Timer implementation for win32 from absolute time (_ftime) to GetTickCount().
This fixes the following bug: When the system time was changed, a heartbeat timeout occurred.
FIXED: - Timeout seems only work properly if EnterMutex() is called before call of GetTickCount() (Patch from Roland Marquis)

Authors :
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Edouard TISSERANT (www.canfestival.org)
Francis DUPIN (LIVIC)
Laurent BESSARD (www.canfestival.org)