DELIA-65802 : Converted properties into methods in IUserSettings

Reason for change: To pass parameters by name instead of "value".
Test Procedure: None
Risks: None
Signed-off-by: Sergey Borushevsky <Sergey_Borushevsky2@cable.comcast.com>

(cherry picked from commit 0a387efa81f67a99385efc7c4e57ec28f62370df)
Change-Id: Idc237a4589c7e7a7e587926eecdca422cf9dfce9