Add .gitignore
Qt: decouple main window
Qt: remove UI file reference from app
Qt: `TouTvApp` -> `QTouTvApp`
Qt: use `super()` instead of `__init__()`
Qt: forgot `main_window.py`
Qt: decouple emission treeview from main window
Qt: actually use `_register_sigint`
Don't subclass QThread, do actual work in slot

Signed-off-by: Simon Marchi <simon.marchi@polymtl.ca>