Add special character map feature

Add a --map option which allows to map special characters, in particular CR and
NL characters which are used in various combinations on varios platforms.

src/bash-completion/tio.in

@@ -18,6 +18,7 @@ _tio()
           -o --output-delay \
           -n --no-autoconnect \
           -l --log \
+          -m --map \
           -v --version \
           -h --help"
 
@@ -56,6 +57,10 @@ _tio()
             COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )
             return 0
             ;;
+        -m | --map)
+            COMPREPLY=( $(compgen -W "INLCR IGNCR ICRNL ONLCR OCRNL" -- ${cur}) )
+            return 0
+            ;;
         -v | --version)
             COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )
             return 0