4145 Remove unused support for "sidecar" models

Feature considerably slows down deletion of projects

Closes af3#4145 (closed)

changed milestone to %AF3 2.20 - Feature Freeze

assigned to @barner

requested review from @bayha

added 1 commit

• 6dd73394 - GREEN

Compare with previous version

Tested (much faster!) and reviewed. GREEN

mentioned in commit 1b383bb3

merged