Cleanup...
Preparing for XSArray...
Bugfix...
Cleanup...
Fixed a bug with XSRelease, calling the classes destructors with an  wrong pointer.
Fixed XSCopy: if a copy callback is provided, the copied instance is now initialised to zero.
Cleanup...
Added a ToString callback for XSStack.
Added an Equals callback for XSStack.
Cleanup...
XSArray methods...