Thread pool branch 2

Continuation of !1164 (merged) which was reverted because StaticFor within RecursiveFor did not work yet.

Steps to finish this branch:

• Merge !1171 (merged) into this branch
• Finish new RecursiveFor by merging https://gitlab.com/aroffringa/aocommon/-/merge_requests/131 into aocommon master
• Finish new DynamicFor by merging https://gitlab.com/aroffringa/aocommon/-/merge_requests/132 into aocommon master
• Finish new StaticFor by merging https://gitlab.com/aroffringa/aocommon/-/merge_requests/133 into aocommon master
• Update this branch to use aocommon master with all these fixes.