CardView: fix issue when creating a card when another card is already focused

Signed-off-by: Christophe Chapuis <chris.chapuis@gmail.com>
CardView: organize cards in groups

Signed-off-by: Christophe Chapuis <chris.chapuis@gmail.com>
Use a singleton for the WindowModel test stub

Signed-off-by: Christophe Chapuis <chris.chapuis@gmail.com>
CardView: be more resiliant to a card destruction

Signed-off-by: Christophe Chapuis <chris.chapuis@gmail.com>
Reorganize CardView objects, and add a concept of active card within a group of cards

Signed-off-by: Christophe Chapuis <chris.chapuis@gmail.com>
CardView: focus last inserted window

Signed-off-by: Christophe Chapuis <chris.chapuis@gmail.com>
CardView: introduce possibility to go to drag mode with a longpress on a card.

Signed-off-by: Christophe Chapuis <chris.chapuis@gmail.com>