Select OR/AND in Marketing rule group

[bjarnef]

In the Marketing section it only set "AND" conditions between rule groups. It would be more flexible to be able to set both AND/OR (or just one of them - match all groups or any group).

E.g. something like this:
http://niklr.github.io/angular-query-builder/

or this:
https://github.com/zebzhao/Angular-QueryBuilder
https://zebzhao.github.io/Angular-QueryBuilder/demo/

It could also be extended with some queries: