`application` argument should be string

[zwn]

Where we supply application as an argument to a function (like record, replay...) we should supply a string instead, that can be used with get_class_by_name. With this change we can replay logs using only generic tools and we can drop the replay capability from i.e. subt/main.py.

It will improve record as well, although not as much since we have custom command line arguments. But it is a step in the right direction anyway.