Implement mapping editor
Implement mapping editor based on old mapping editor (ScheReg v1) and new schema editor
(from redmine: issue id 396, created on 2018-01-22tgradl, closed on 2018-01-22)
- Relations:
- relates #398 (closed)
- relates #397 (closed)
- relates #407 (closed)
- relates #408 (closed)
- relates #418 (closed)
- relates #419 (closed)
- relates #420 (closed)
- relates #423 (closed)
- relates #424 (closed)
- relates #426 (closed)
- relates #427
- relates #428