add sigdanger support

Signed-off-by: Mattias Andrée <maandree@operamail.com>
add --immortal option

Signed-off-by: Mattias Andrée <maandree@operamail.com>
danger is deadly for the echo and the clipboard servers

Signed-off-by: Mattias Andrée <maandree@operamail.com>
add todo for kkbd on what to free on danger

Signed-off-by: Mattias Andrée <maandree@operamail.com>
remove old debug print + mds kernel should ignore danger

Signed-off-by: Mattias Andrée <maandree@operamail.com>
add todos on things to do on danger

Signed-off-by: Mattias Andrée <maandree@operamail.com>