Patch: PullDown Covers

My updated version of the Pulldown-Covers patch for 3.x

Source:  https://gitlab.com/Thaodan/sailfishos-patch-pulldown-covers

Changes:

• added a pulley menu (together with a needed SilicaFlickable and Rectange for cropping)
• original cover action buttons set to disabled
• cover action icons' opacity changed to 0.5 (to show that the buttons are inactive)

Warnings:

• once you have more than 9 apps open, it may interfere with scrolling. I may add means to prevent this in the future, but for now, it is just up to you how many apps you have open
• it is now bit harder to open the menu, as you cannot scroll on the app covers - either scroll in between covers, or swipe from the bottom of the screen to access the menu
• seems to conflict with the top menu when the finger is not direct on the app cover

Planned:

• think about reversing the order of the items in pulley menu
• settings page?