[alarmtracker] Refactor alarm state tracking functionality

The code is hard to read, potentially leaves active timers behind
on unload, alarm state exposed to libdsme clients differs from
one used within dsme, etc.

Group and name functions by type, improve debug logging, add
doxygen comments.

There should be no functional changes, except: re-evaluate timer
is cancelled on unload, and alarm state notifications within
dsme and via libdsme are unified.

Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

Makefile.custom

@@ -328,6 +328,7 @@ CLEAN_SOURCES += dsme/dsmesock.c
 CLEAN_SOURCES += dsme/timers.c
 CLEAN_SOURCES += dsme/utility.c
 CLEAN_SOURCES += modules/abootsettings.c
+CLEAN_SOURCES += modules/alarmtracker.c
 CLEAN_SOURCES += modules/batterytracker.c
 CLEAN_SOURCES += modules/dbusautoconnector.c
 CLEAN_SOURCES += modules/dbusproxy.c
@@ -374,7 +375,6 @@ DIRTY_SOURCES += dsme/mainloop.c
 DIRTY_SOURCES += dsme/modulebase.c
 DIRTY_SOURCES += dsme/oom.c
 DIRTY_SOURCES += getbootstate/getbootstate.c
-DIRTY_SOURCES += modules/alarmtracker.c
 DIRTY_SOURCES += modules/bootreasonlogger.c
 DIRTY_SOURCES += modules/emergencycalltracker.c
 DIRTY_SOURCES += modules/iphb.c