Possible race condition in CLog

[KerstinKeller]

Problem Description

There is a possible race condition in the CLog class.
Log doesn't lock the mutex to access the member variable m_level.

How to reproduce

Concurrently calling Log and SetLogLevel functions which will result in a datarace.
Probably, log_level and actual logging variables (file...) need to be protected separately.

Could be fixed, or handled separately, see (#1377)

How did you get eCAL?

Other

Environment

eCAL master.

eCAL System Information

No response