Optionally generate frame id at the beginning

[classic0]

Currently the only way to associate something with a running frame is after it has been completed. Due to the id being generated after closing the frame, not when initiating.
It might have some reasons for being so, I well do not read the code it's written in. But I propose that it could be optionally (atleast) generated on start.

I had big hopes for options.log_current providing just that functionality but it instead shows as "current". Which is okay.