Implement new mapped concept editor dialog

instead of edit grammar / function in context menu of a mapped concept
Support for multiple input and output elements
Support for multiple grammars (one or more per input element?)
Support for multiple functions (one or more per grammar?)
Include sample handling for concept as a whole

(from redmine: issue id 544, created on 2018-01-22tgradl, closed on 2018-01-22)

Relations:
- relates #536 (closed)

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