Do not let ImageJ settings impact macros and scripts

Right now, the current ImageJ settings (e.g., whether Edit>Options>ImageJ2 "Use SCIFIO when opening files" is ticked) impact the behavior of macros and scripts. This can cause very difficult-to-diagnose problems, which can only be "fixed" by clearing the preferences. Further, it ruins reproducibility: write a macro and give it to a colleague and it may not work the same way on their exact same version of ImageJ!

We need to concoct a solution to this conundrum. Probably, all ImageJ commands should always take the relevant settings as parameters, but get filled from the ImageJ settings via a preprocessor. That way, recorded scripts and macros would embed the value in the recorded script, rather than assuming it from the program state next time the macro is run.