Added symbolic values for the eyelid positions (open, halfopen, closed)
Allow for debugger to co-exist with thread cancellation
Fixed wrong import
Give explicit names to resources
Name threads according to what they are currently doing

This helps debugging
[actions/navigation] Make turn/move cancellable
[actions/navigation] Added look_for_beacon
[actions/sound] Properly close audio stream when cancelling action
[actions/look] Make sneakin cancellable

While here, fixed typo
[helpers/position] Make sure we return floats (and not numpy.float64)

This is required for the introspection server.
While here, fixed a typo.
[expe/croquignole] Properly look for beacons before trying to reach them