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Make RegularExpression reentrant (thread safe)

Sebastian Holtermann requested to merge sebholt/kwsys:regular-expression-thread-safe into master

RegularExpression used global variables shared by every instance. This made it impossible to use it concurrently even with independent instances.

By moving the once shared variables into a class on the stack RegularExpression becomes reentrant. That means that separate instances of RegularExpression can be used concurrently in different threads.

Additionally there is a new RegularExpressionMatch class that can be passed to a new two-argument RegularExpression::find() method. The new method is thread safe when used with separate RegularExpressionMatch instances. This allows to use the find() method of a single RegularExpression instance concurrently on different strings with independent RegularExpressionMatch results.

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