Implementing deaths

[erik-rosenstrom]

This PR implements the effects of a dead symptom status. This involves disallowing future plans that are scheduled to happen for dead individuals and removing them from settings.

Changes

• A death module was created with event subscription to listen for dead symtpom status progression. Upon death the alive person property is set to false. A context extension was created with the method to ergonomically check the alive status.
• Tests were add to the death module to ensure all functionality of death occurs how we expect.
• A method is added to settings context extension to remove individuals from settings
• Checks were add to multiple places in the infection_manager and infection_propagation_loop modules to check if the person is alive before proceeding

This may be refactored depending if it is worthwhile to cancel plans by person id. This would be implemented in ixa