Change Initiative tree view improvements
Change Initiative tree view improvements

- overview section now shows tree based context view
- bonus: fixed migration script for mssql
- removed old change initiative navigator section as replace by tree
- entity link now support CI's and minor ui improvements

 #CTCTOWALTZ-1324
 #4166

davidwatkins73/waltz-dev,kamransaleem/waltz,khartec/waltz,rovats/waltz,khartec/waltz,davidwatkins73/waltz-dev,rovats/waltz,rovats/waltz,khartec/waltz,kamransaleem/waltz,rovats/waltz,kamransaleem/waltz,kamransaleem/waltz,khartec/waltz,davidwatkins73/waltz-dev,davidwatkins73/waltz-dev