Switch from absolut microseconds since epoch to a monotonic clock with
realtive values. Switch from unsigned long long to double.
This aligns it with how we present time in efl. ecore_time_get is used
when possible. For the tizen modules we convert the the epoch timestamp
we get into a double. This is still a working monotone clock source.
As this will be released the first time with 1.8 we don't have any API
break here.
Changes also in this commit:
* fix missing EAPI in symbols used by modules
* removed old libudev and libmount support as agreed by discomfitor/zmike
* replaced __UNUSED__ with EINA_UNUSED
* fixed docs hierarchy
SVN revision: 82100