[connman] plugins: Create an interface for wakeup timers
Mobile phones and other battery-powered systems may suspend often and for long periods of time. However, connman may need to perform scheduled operations such as DHCP renewal at specific times regardless of whether the system is suspended or not. Provide a plugin interface for implementing wakeup timers which can be used to request the system to wake up from suspend at a given time. These timers are intended for relatively infrequent events which do not need high timing precision, not as general purpose replacement for g_timeout functions, as wakeup from suspend can be a slow and expensive operation. If no wakeup timer is implemented, regular glib timeouts are used. Note that only one wakeup timer plugin may be registered at a time.
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