keyd: Update conf files to new 2.0 syntax

New config syntax uses [ids] section to select which input devices are
affected instead of file names, so we can have all settings (for
similarly set up keyboards) in a single default config file.

The file itself needs to end in `.conf` instead of the old `.cfg` and
there is a slight difference in syntax between the old `C` and the new
`control` for mapping the control key. That is about it.

install.sh

@@ -46,7 +46,6 @@ check_consent() {
         printf "%s %s " "$2" "$default_consent"
         read -r answer
         if [[ "$1" == "n" ]] && [[ "$answer" != y* ]]; then
-            echo first
             printf "%s\n" "$3"
             false
         elif [[ "$1" == "y" ]] && [[ "$answer" == n* ]]; then