It is possible for games to call factory("libName") to check if an
XObject has been opened, which requires the names to match.
Fixes the XObject loader in Virtual Nightclub.
The previous arrangement was to copy the bits of Lingo state back and forth from
the Window object to the Lingo instance, and query the window for the
callstack. This refactor consolidates the current Lingo state into a single
struct, owned by the Window object and accessible via a pointer on the
Lingo object.
Widget is an XObject used in Alice: An Interactive Museum.
The assumption is that getPro returns the drive letter as
the return value of getPro is assigned to a variable called drv.
Resolves the following errors from: https://bugs.scummvm.org/ticket/13204
- WARNING: BUILDBOT: Uncaught Lingo error: Call to undefined handler 'Widget'. Dropping 1 stack items!
- WARNING: varFetch: global variable drv not defined!
