T tracer: don't depend on T_BUFFER_MAX anymore in the tracers
Whenever the value T_BUFFER_MAX changes, the tracers had to be recompiled. The only reason why it was needed is because we used some fixed size buffers to read events. This commit removes this restriction. Also, with the basic simulator, this value T_BUFFER_MAX now comes with an #ifdef which would have required some special hackish-level tricks in the tracers, which is not good. Let's just allocate memory when needed.
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