Replace single time range configuration with support for up to 10
configurable session periods. Rename INTERVALO_CLIQUE_ESPERA to
INTERVALO_CLIQUE_GLOBAL for clarity. Update dentro_horario function
to accept list of period tuples instead of individual start/end times.
BREAKING CHANGE: HORA_INICIO and HORA_FIM environment variables are
replaced by PERIODO_{n}_INICIO and PERIODO_{n}_FIM variables (n=1-10).
INTERVALO_CLIQUE_ESPERA is renamed to INTERVALO_CLIQUE_GLOBAL.
marco