pastebuf: make sure \e[0m will reset the colors

and fixed command_cb to handle more than 2 parameters.
rename buffer_mark to msgcolor
forgot to delete this one
pastebuf: disable hiding error for 0.4.4+

stderr issue is fixed in
weechat/weechat@9543f9c03494a9ced1dd0d5529c43b931e7d9d0a
typeass: add digraphs
msgcolor: randomize color

- randomize color everytime there's a color request
- replace , with space as color separator
- reorganize script
readme: add notes about other scripts