Reporting deletion/addition for the unchenged tokens

[maorethians]

During extracting additions from this commit, RM reports deletion and addition for exactly the same modifier and simpleName while it could match their surroundings.

[tsantalis]

@pouryafard75 It seems we don't support sealed and permits.

[pouryafard75]

@tsantalis The issue is on the core actually (probably even the visitor), I update diff wrappers accordingly after you introduce the API for classDiff.

[tsantalis]

@maorethians @pouryafard75

The issue has been fixed