Make mpv launch retries and delay configurable.

Allow passing a list to repeat command line arguments.

Ignore close failure on Windows.

Fix exception loop.

Handle socket/pipe connection loss.

Allow handling of MPV closing.

Fix process never closing if mpv is not installed. (#4)

Handle data being null.

Make wait_for_property actually wait for a change.

Handle issue where checking a win32pipe twice returns different result.