refactor the player_shouldstop/sio_write dance in a function

fix argc check argc can be -1 if we called noarg with argc=0, because optind is 1.

correctly handle arguments for sub-commands things like "--" should be skipped etc, easier to rely on getopt(3).

output the two repeat bits in two different lines

ctl_noarg: allow argv == 0 for the implicit "status" case

rework how the daemon is automatically spawned The previous way introduce possible races if multiple `amused' instances try to start the daemon. The new approach is heavily lifted from how tmux does it, but with some minor differences. If the initial connect fails we try to grab a lock to safely execute the daemon only one time. In fact we try to connect one more time even when we hold the lock because another instance can grab the lock, start the daemon and release it between the failure of connect and the first flock. It also changes slightly how the program behaves and how the -d option works. Now running `amused' without arguments is a synonym for `amused status' and the -d option only works if no arguments were given and if the daemon wasn't running.

rework the smallest unique prefix sentence a bit

bump date

point out that the regexp is case insensitive

use the -p flag in the save state example

rework `load' description

replace stdin/err with standard input/error

setsong in playlist_swap if the player is stopped

keep the current song if load input was generated by show -p `amused show -p' generates a listing in the form of song > current song song ... This adds an heuristic to `amused load' so that the current song can be set if it's prefixed by "> ". It's particularly useful when re-importing the state from a previous run.

reuse main_senderr