button was causing lots of LOG_WARNING due to enabling visuals unnecessarily
- reduced complexity by removing function pointer usage
- fix the value passed into register visual so that they are correctly enabled
- added a check to test that a visual exists before enabling it (not ideal but nicer than warnings)
- remove redundant RelayoutRequest calls from SetProperty
Change-Id: I45e1deda22e13446d488d74d990ccf96f77e9eb0