Replaced search dialog graphics and refactored UI

Using new icons and textures, changed the interface of search dialog to match
the reference layout.
Added stub search input area in search dialog
Aligned title in search dialog
Added date label to each element's header

In patient search dialog, on the right of patients' names there are dates of
profile creation.
Active profile name is highlighted in blue

When the user expands some profile, the name of the holder is highlighted in
blue, as by reference.
Using non-transparent gradient as background

When patient search dialog is invoked, the background is filled with a
gradient, instead of image with transparency.