genlist: need to custom fish_eye effect

genlist: need to custom fish_eye effect

Customisation of fish eye effect is required for spinner and more option
to achieve the UX

"vi_effect" in genlist: enable/disable all items opearation
"item_gap": padding values to be applied between items on fish eye effect in spinner
            parameter 1: position adjustment for the n-1 and n+1 item to center item n
            parameter 2: position adjustment for the n-2 and n+2 item to center item n
"proxy_gap": Padding for proxy for top and bottom item in more option
"proxy_top_offset": Offset adjustment for top item in more option
"proxy_color": To custom color transition

Change-Id: I1a7cfbb035daefca1173f83000c56c14ef9d7288
Signed-off-by: HyukSoon Choi <hs619.choi@samsung.com>