Add swipe navigation on map items

[darowsluk]

As a user I want to swipe down on the map item to close it

Requirements:

• Implement modal bottom sheet for the map item view
• Add curved corners to image
• Add gradient to background color

[darowsluk]

Resource for dragable modal bottom sheet: https://www.youtube.com/watch?v=AjAQglJKcb4

[knutm92]

@darowsluk Just came across a cool blur effect that I thought might be interesting as a layer on top of the map background. Here's a link in case you'd like to test it out https://www.youtube.com/watch?v=WxP9ABzfgow

[darowsluk]

@knutm92 Thanks for the link. I tried around different looks, but it seems to me that the gradient background works the best since the blurred map looks unfinished.

[darowsluk]

fixed #126