Replace reset estimator in non-swarm examples

[knmcguire]

The reset estimator has been converted for all swarm examples to a cflib function but not for the regular single drone examples...

It would improve the cleanliness of all the examples, but might compromise the backward compatiblity that #288 was experiencing.

[diegoch-it]

@knmcguire These are the examples to be modified (by folder):

In autonomy:
-autonomousSequence.py
-autonomous_sequence_high_level.py
-autonomous_sequence_high_level_compressed.py
-circling_square_demo.py
-full_state_setpoint_demo.py

In lighthouse
-lighthouse_openvr_grab.py
-lighthouse_openvr_grab_color.py
-lighthouse_openvr_multigrab.py

In mocap
-mocap_hl_commander.py
-qualisys_hl_commander.py

In positioning
-flowsequenceSync.py
-initial_position.py

The function to be created in SyncCrazyflie class and replaced in the examples are:
-reset_estimator()
-wait_for_position_estimator()

Should I create a pull request for each example?

[knmcguire]

absolutely! Make sure to test it out though on at least one :) Thanks!