stats.lua: clip lines with ${term-clip-cc}

Use the property introduced in bf025cd289 to clip the lines of stats.lua with accurate unicode width detection and considering --msg-module and --msg-time. This allows removing the term ellipsis functions. Also use script-opts-append instead of script-opts in the docs so script-opts in mpv.conf, which could change keybindings, are not overriden.

GCGuido Cella committed 2 years ago