Add a simulation log output file

[fractalsbyx]

Would be useful for debugging, simulation reproducibility, environment info, etc. Could display things like simulation start time, everything that gets presented in the console log, number of cores, threads, errors if they occur, warnings, variable attributes, etc. Would be especially useful for warnings as they may be missed at runtime.

This wouldn't be something that provides data like integrated fields, but metadata about the run.

[landinjm]

In this case, we can par down the output stream on some of the miscellaneous print statements.

Could also include more detailed timing information