mapserver: Replaced mapserver/tilecache dependency with SkyLines tiles

SkyLines is serving airspace-only tiles now that we can easily use without the
need for a dedicated mapserver or tilecache
make: Extracted clean-downloads and clean-deploy targets
make: Fixed mootools concat order

Again...
analysis: Use py-xcsoar library for analysis
settings.js: Removed domain parameter from Cookie.write() call

Makes this work on localhost
flask: Added basic flask app
flask: Converted get_userconfig.py to Flask Blueprint
flask: Converted upload_igc_file.py to Flask Blueprint
flask: Converted get_uid.py to Flask Blueprint
flask: Converted get_height.py to Flask Blueprint
flask: Serve storage/airports/ folder under /airports route
flask: Converted save_temp_task.py to Flask Blueprint
flask: Improved get_uid_from_cookie() method
flask: Converted save_task.py to Flask Blueprint
flask: Converted download_task_qr.py to Flask Blueprint

and replaced qrencode dependency by python-qrcode and pillow
flask: Converted download_task.py to Flask Blueprint
flask: Converted get_task.py to Flask Blueprint
flask: Converted remove_task.py to Flask Blueprint
flask: Converted search.py to Flask Blueprint
flask: Fixed get_user_config_as_json() usage