amusing: bind C-q to quit the window

amusing: / to focus the filter bar; esc to un-focus it

amusing: add some keybindings

amusing: don't show status string and remove the `status' variable

amusing: show the current played song too

add contrib/amusing: a gui written in Tcl/Tk

contrib/amused-monitor: make use of the new extended info adjust amused-monitor not to query amused on certain events but use the new extra info that `amused monitor' prints.

enrich `amused monitor' reported events The monitor mode now has access to some additional information other than just the name of the event. The `mode' and `seek' events now report the mode status and the position/duration respectively, allowing consumers of `amused monitor' to show correct and coherent information. It helps in particular applications like `amused-monitor' (in contrib/) that show a progress bar for the current song. Before, they had to run their own timers and periodically synchronize using `amused status', now they can just update the state in the same `amused-monitor' event loop.

drop notify_seek var; always notify on seeks First move towards a change in the behaviour of `monitor': advancement on tracks during the play are reported also every second, as the music is played, not only when there's an explicit seek.

configure: add -Wextra to the mix

tweak the README

consistently use of shell' prompt; fix typo

typo

rephrasing

amused-monitor: fix sprintf error for tracks hours long