added basic editing for name and description

...ui/src/main/java/simpleex/ui/AbstractFxAppController.java

...eexample2/fxui/src/main/java/simpleex/ui/LatLongCell.java

...fxui/src/main/java/simpleex/ui/LatLongCellController.java

...i/src/main/java/simpleex/ui/MetaDataEditorController.java

...xample2/fxui/src/main/java/simpleex/ui/MetaDataEvent.java

...2/fxui/src/main/resources/simpleex/ui/MetaDataEditor.fxml