Various

- Changed constant name in MacSystemProfiler to kSystemProfilerShellPath for clarity.
- Copied GetFolderItemFromPOSIXPath from Cocoa to FileManager and made it Global.
- Deprecated Cocoa.GetFolderItemFromPOSIXPath.
- Changed FileManager code to utilitize FolderItem.NativePath functions in Xojo.
- Changed FileManager.NativePath from Global "extends" function to Public with parameter.
- Changed local variable declarations in two methods from "str" to "s" to avoid confusion with the native function Str.
- Added pragmas for unused variables in various methods.