Add phase constraint and eclipsing binary to base scheduler

[gnthibault]

Doc for Phase constraint: https://astroplan.readthedocs.io/en/latest/api/astroplan.PhaseConstraint.html#astroplan.PhaseConstraint

Tutorial for eclipsing binaries:
https://astroplan.readthedocs.io/en/latest/tutorials/periodic.html

Expected: add a per-target constraint management, that enables to completely override the top level one.
Expected: add explicitly the localHorizon constraint in the conf file
Test the phase stuff and the eclipse binary stuff if it is usable

Make sure this feature is usable both for scheduler and base scheduler