Remove both copies of the 15-fold copies of the JSI_IGUIObject::getProperty and setProperty setting case handlers following the FromJSVal / ToJSVal template specializations implemented in
- JSI_GUIColor in rP22534
- bool in rP22538
- CGUISeries and CGUIList in rP22539
- primitives in rP22540
- EAlign and EVAlign in rP22556
- ClientArea in rP22557
- CColor in rP22558
- CGUISpriteInstance rP22570
- CPos in rP22573
The removed JS_ReportError calls were redundant.