Adapt to const nonconst new API

Adapt to the new API using const and non const pointers: core !443

created branch 21-adapt-to-const-nonconst-new-api to address this issue

mentioned in merge request !30 (merged)

mentioned in commit 38f96f29

closed with merge request !30 (merged)

mentioned in merge request !31 (merged)

mentioned in commit 12de962b