* Allow for both -e and -R to start a BSV file recording at a state
The key issue is that loading a state takes some time, and the BSV
recording shouldn't start until that's done.
The minimal patch for this would just be a change to runloop.c which
moves movie initialization after entry state loading, throwing in a
task_queue_wait(). This makes for some awkward repeated autoload OSD
messages and doesn't solve the underlying issue.
Most of this change puts BSV recording start/stop into tasks, like
saving and loading are tasks; this was important to centralize BSV
operations a bit more and is the first part of a refactoring towards
more robust input recording. The necessary wait is introduced in the
begin-recording callback.
Co-authored-by: Joseph C. Osborn <jcoa2018@pomona.edu>