Turn off some warnings-as-errors
Update ITK 4.13 to latest snapshot

Summary: Fix gcc 10 build

Test Plan: CI, current setup and future Fedora 32 client

Reviewers: O1 MITK Reviewer Group I, kislinsk

Reviewed By: O1 MITK Reviewer Group I, kislinsk

Subscribers: kislinsk

Differential Revision: https://phabricator.mitk.org/D304