Delete person from CC

[karthickkc]

Deletes persons from associated Concerts Adds person to a Concert

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Files with missing lines	Coverage Δ	Complexity Δ
...dress/logic/commands/AddConcertContactCommand.java	100.00% <100.00%> (ø)	12.00 <1.00> (?)
...du/address/logic/commands/DeletePersonCommand.java	100.00% <100.00%> (ø)	7.00 <0.00> (ø)
...s/logic/parser/AddConcertContactCommandParser.java	100.00% <100.00%> (ø)	3.00 <1.00> (?)
.../seedu/address/logic/parser/AddressBookParser.java	100.00% <100.00%> (ø)	15.00 <0.00> (ø)

... and 4 files with indirect coverage changes

[karthickkc]

fixes #84