i3: use mpc instead of ncmpcpp for mpd bindings

The commands available in mpc were removed from ncmpcpp.
Update mpv options
nmpcpp: remove old option
ranger/rifle: mpv doesn't need '--vo null' for audio files anymore
chaps: remove finished mangas
dmenu: fix arguments escaping
Add newsbeuter: vacuum on start
trmission: store log messages to /dev/null
vimrc: enable breakindent option
xinitrc: discard wm's stdout
gdb: no more funky prompt
xseldo: as mpv prefers youtube-dl to quvi, try to get used to it