Incremental work: adding a new plugin to filter out gaze positions that are greater than given distance away from previous.
Incremental work: registering filter_fixations plugin
Cosmetics: fixing typos
filter fixations plugin incremental work - requires check for scan path plugin
edited -- copy the data/contents of recent_pupil_positions don't make a reference
added check if scan_path exists - if not, then create it and clean it up upon exit of filter_fixations.
small fix
Merge branch 'player_filter_plugin'

Conflicts:
	pupil_src/player/main.py
adding GUI settings to new plugin. Small fixes.