Add soft culling #51
Description
Soft culling means deactivating snitches instead of removing them like current culling does. A deactivated snitch can be reactivated by a player entering its field.
Example config entries (pseudocode):
Hard cull: 24 (days)
Soft cull: 12 (days)
Snitches will fully cull after 24 days and soft cull after 12.
Hard cull: 24 (days)
Soft cull: 0 (days)
Snitches will fully cull after 24 days and never soft cull.
Hard cull: 0 (days)
Soft cull: 12 (days)
Snitches will never fully cull and will soft cull after 12 days.