Replaced reset estimator in single drone examples

[ArisMorgens]

Converted the 'reset estimator' to a cflib function for the regular single drone examples so the scripts are getting smaller and look cleaner. This is based on this issue. The new file is located in crazyflie-lib-python/cflib/utils.

Modified Files:

In autonomy:

1. autonomousSequence.py
2. autonomous_sequence_high_level.py
3. autonomous_sequence_high_level_compressed.py
4. circling_square_demo.py (I removed the reset estimator because the swarm class is used.)
5. full_state_setpoint_demo.py

In lighthouse

1. lighthouse_openvr_grab.py
2. lighthouse_openvr_grab_color.py
3. lighthouse_openvr_multigrab.py

In mocap

1. mocap_hl_commander.py
2. qualisys_hl_commander.py

In positioning

1. flowsequenceSync.py
2. initial_position.py

[gemenerik]

To make the tests pass, run pre-commit locally, and make sure it passes. Then commit and push the changes.

[gemenerik]

Nice work!