Profile result .json files should not be under version control

[0xworks]

Is your feature request related to a problem? Please describe

Not really a "feature request", but more of a suggestion.

The result files from profiling (HazelProfile-[Startup|Runtime|Shutdown].json) shouldnt be under version control.

In order to not to have to keep remembering to not-commit these files, it would be better if they were created in a directory outside of the source tree.

Describe the solution you'd like

Remove these .json files from version control. When creating instrumenation session, create the files in temporary directory instead of the current directory (which is likely to be within the hazel source tree)

Describe alternatives you've considered

I considered just adding the files to .gitignore. But this doesn't seem like the right solution (e.g. what if someone runs Sandboix app from a different working directory. What if someone adds a new session (you'd then need to remember to update the .gitignore)