Implement Delete and Edit functionality

[rebeccalaujx]

Delete:
Deletes the specified resident from the address book.

As a hall/ residence admin, I can

• delete a resident’s information from the database
• delete multiple residents in a single command

so that I can

• remove the data of a resident who has moved out
• save a lot of time when deleting multiple residents

Format: delete INDEX...

• Deletes the resident at the specified INDEX.
• The index refers to the index number shown in the displayed resident list.
• The index must be a positive integer 1, 2, 3, …​
• Able to delete multiple residents at once by inputting multiple indexes, each separated by a space.

Examples:

• view followed by delete 2 deletes the 2nd person in the address book.
• view followed by delete 1 2 3 deletes the first 3 people in the address book.
• search n/Anne followed by delete 1 deletes the 1st person named Anne in the results of the find command.

Edit:
Edits an existing resident in the address book.

As a hall/ residence admin, I can

• edit each resident’s details
• edit the particulars of many residents in a single command
• edit a resident's last FET date

so that I can

• update the changes in the residents’ details if necessary
• save a lot of time when editing the details of multiple residents
• update the current residents’ last FET dates if they have taken a new FET

Format: edit INDEX [n/NAME] [p/PHONE_NUMBER] [e/EMAIL] [r/ROOM] [v/VACCINATION_STATUS] [f/FACULTY] [c/CCA]…​

• Edits the resident at the specified INDEX. The index refers to the index number shown in the displayed resident list. The index must be a positive integer 1, 2, 3, …​
• At least one of the optional fields must be provided.
• Existing values will be updated to the input values.
• Able to edit multiple residents at once by inputting multiple indexes, each separated by a space.

Examples:

• edit 1 e/johndoe@example.com r/A101 Edits the email address and room number of the 1st person to be johndoe@example.com and A101 respectively.
• edit 2 n/Betsy Crower c/ Edits the name of the 2nd person to be Betsy Crower and clears all existing CCAs.
• edit 1 2 3 v/true Sets the vaccination status of the 1st, 2nd, and 3rd resident as vaccinated.