Improve Maintenance periods filters adding new possibilities

Improve Maintenance periods section filters.

Add new fileds and allow filtering maintenance by:

• Time range
• Involved hosts (select a given host and show all Maintenance related to it)
• Involved tags (select a given tag name/value and show all Maintenance related to them)

Keep the fields already in place as subfilters. Exemple:
Filter for a specific time range where host X is present and maintenance state is active.