Make @Issue repeatable (#1030)

[Vampire]

This change is 

[leonard84]

I don't see a reason to make this repeatable, what additional functionality do we get here?

[codecov]

Codecov Report

Merging #1189 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1189   +/-   ##
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  Coverage     75.96%   75.96%           
  Complexity     3647     3647           
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  Files           393      393           
  Lines         11113    11113           
  Branches       1369     1369           
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  Hits           8442     8442           
  Misses         2192     2192           
  Partials        479      479           

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[Vampire]

I don't see a reason to make this repeatable, what additional functionality do we get here?

Same as for some of the others.
Being able to instead of

@Issue(["http://my.issues.org/FOO-1", "http://my.issues.org/FOO-2"])

write

@Issue("http://my.issues.org/FOO-1")
@Issue("http://my.issues.org/FOO-2")

This makes it better commentable if necessary,
better copyable if necessary,
subjectively better readable for some,
semantically better matching (it is @Issue, not @Issues)
...

Imho most of these should have been repeatable right from the start.
But then it was not possible, so an array value was the next best choice for multiple values.
And now having both allows old code to continue to work and new code to improve.
Or for some of the annotations like @Use maybe to group some values but not others.