[RELEASE] Sprint delhi

Closes #172 and #171

See merge request !20

Features/ui ux improvements

See merge request !19

[RELEASE] Sprint cordoba

Closes #138 and #159

See merge request !18

Only consider this gesture when user start the touch  in lower 1/3 portion of the screen.

Add blur effect into launcher (Closes #138 and #159)

See merge request !16

1. Use cached blur wallpaper instead of live blurring for smooth visual effects.
2. Make Navigation Bar transaprent to match with bottom dock.
3. Use transparent grey color as background for folder icons.
4. Use placeholder in case wallpaper is not available.

1. Consider navigation bar while doing blur.
2. Properly set offset for the wallpaper to prevent shifted blurred background.

Blur background behind popped-up folder apps and swipe-down to search container with a fallback case

Remove visible white color hot zone

See merge request !14