[TIMOB-20391] Parity: Separator style properties for TableView and ListView not aligned

This looks a bit messy: * In 5.2 we introduce [Ti.UI.TABLE_VIEW_SEPARATOR_STYLE_NONE](http://docs.appcelerator.com/platform/latest/#!/api/Titanium.UI-property-TABLE_VIEW_SEPARATOR_STYLE_NONE) and [Ti.UI.TABLE_VIEW_SEPARATOR_STYLE_SINGLE_LINE](http://docs.appcelerator.com/platform/latest/#!/api/Titanium.UI-property-TABLE_VIEW_SEPARATOR_STYLE_SINGLE_LINE) for Android and iOS but the descriptions don't say where you can use these. * [Ti.UI.TableView.separatorStyle](http://docs.appcelerator.com/platform/latest/#!/api/Titanium.UI.TableView-property-separatorStyle) still says for iOS you should use [Ti.UI.iPhone.TableViewSeparatorStyle.NONE/SINGLE_TINE](http://docs.appcelerator.com/platform/latest/#!/api/Titanium.UI.iPhone.TableViewSeparatorStyle) and for MobileWeb [Ti.UI.MobileWeb.TableViewSeparatorStyle.NONE/SINGLE_LINE](http://docs.appcelerator.com/platform/latest/#!/api/Titanium.UI.MobileWeb.TableViewSeparatorStyle) * [Ti.UI.ListView.separatorStyle](http://docs.appcelerator.com/platform/latest/#!/api/Titanium.UI.ListView-property-separatorStyle) says it's iOS only and you should use [Ti.UI.iPhone.TableViewSeparatorStyle.NONE/SINGLE_TINE](http://docs.appcelerator.com/platform/latest/#!/api/Titanium.UI.iPhone.TableViewSeparatorStyle) I'd suggest: * We create Ti.UI.LIST_SEPARATOR_STYLE_* (like we have [Ti.UI.ACCESSORY_TYPE_*](http://docs.appcelerator.com/platform/latest/#!/api/Titanium.UI-property-LIST_ACCESSORY_TYPE_NONE)) for iOS, Android and MobileWeb * We let Ti.UI.TableView.separatorStyle and Ti.UI.ListView.separatorStyle use these for iOS, Android and MobileWeb * We deprecate Ti.UI.TABLE_VIEW_SEPARATOR_STYLE*, Ti.UI.iPhone.TableViewSeparatorStyle and Ti.UI.MobileWeb.TableViewSeparatorStyle * We extend support for Ti.UI.ListView.separatorStyle to Android