add output colorization support using regexes

cmd/shortusage.go

@@ -13,6 +13,7 @@ const shortusage = `tablizer [regex,...] [-r file] [flags]
 -x col,...   use custom headers                      -d  debug
 -o char      use char as output separator            -g  auto generate headers
 
+-K /pattern/foreground[:background]/ colorize pattern of output
 -O org  -C CSV  -M md  -X ext  -S shell  -Y yaml  -J json  -P template
 -a sort by age   -i sort numerically   -t sort by time   -D sort descending order
 -m show manual   -v  show version      --help  show detailed help`