Cleanup profiler and make is as a context manager

Description

This transforms the profiling to be a context manager.

Currently, we needed to call start then stop on profiling. This can add errors where we would be stopping incorrect profilers.

Moving to a context manager allows us to not have this problem and makes it clearer which part of the code is getting profiled.

I also remove unused topics for profiling.

We can now use the context manager as a decorator.

Changes proposed in this merge request:

• Use a context manager for profiling
• Remove unused profiling topics

Fixes #876 (closed) #877 (closed)