creazyflie worker thread will handle sending and receiving crazyflie specific data

Streamlined USB flashing

See merge request !69

# Conflicts:
#   .gitignore

need to fix compilation bugs

close !73

Crazyflie groundstation

See merge request !70

Test stand hardware update

See merge request !72

Emergency stop disable

See merge request !71

fully working with 'make flash_dfu'

Still not working

all student files created

See merge request !68

not rebooting into DFU mode and failing self check on startup. see issue !81

how to send setup requests from host

Removed position and velocity control from student controller

See merge request !67

Update docs

See merge request !66