Colon: ad hoc delimiter in some action operators

In a small number of operators, a colon is used instead of other more normal delimiters and joins.

In some of the operators relating to composites, a colon is used where a dot-operator type of dot-join might be expected:

• compositeFor(nameStr):count
• compositeFor(nameStr):kind
• compositeFor(nameStr):name
• compositeFor(nameStr):role(roleStr)
• compositeFor(nameStr):roles

In the stream processing group of operators, Stream.eachLine(loopVar[:condition]){actions} uses a colon where a comma argument delimiter might normally be expected.