Renamed gswe_moment_get_aspects() to gswe_moment_get_all_aspects()

Just to make the API to seem consistent.
Renamed gswe_moment_get_mirror_mirrorpoints() to gswe_moment_get_mirror_all_aspects()

Just to make the API to seem consistent.
Added some padding members to both GsweMoment and GsweTimestamp

I'd like to keep the ABI as stable as possible. With all the possible
additions in my mind, it is still possible I won't be able to keep it,
even with this much reserved slots.
Finalized API

From this on, API (and hopefully ABI) change is very unlikely
Merge branch 'master' of github.com:gergelypolonkai/swe-glib