Event: for signaling feature use pipe(2) instead of eventfd(2)

Signed-off-by: Eduardo Silva <edsiper@gmail.com>
Core: on initialize threads, zeroed variables

Signed-off-by: Eduardo Silva <edsiper@gmail.com>
Core: initialize services after thread key creations

Signed-off-by: Eduardo Silva <edsiper@gmail.com>
FConf: add alias duda_string_line

Signed-off-by: Eduardo Silva <edsiper@gmail.com>