Remove kinematic connection check in initializeRobot()

See merge request sw/simox/simox!154

Remove kinematic connection check in initializeRobot() since it is checked later when attachements were handled

Fix: Fix using height as half extent for bullet collision shape from primitive cylinder

See merge request sw/simox/simox!152

Flatten robot for physics simulation

See merge request sw/simox/simox!149

Feature/four bar +x

See merge request sw/simox/simox!132

CI: Improve testing, JUnit output

See merge request sw/simox/simox!151

CI: Create docker container

See merge request sw/simox/simox!150