Fix doors tracking and improve Lua error reporting

[emosaru]

Summary

• Fix case-sensitive code lookups: Remove ToLower() calls in ItemDatabase code provider indexing that broke Lua packs using case-sensitive item codes (e.g. door slots in CodeTracker)
• Fix IgnoreUserInput blocking IClickHandler: CanExecute now always returns true so capture grids can intercept clicks on IgnoreUserInput items; the guard runs in Execute after the IClickHandler check. Removed IsHitTestVisible binding that blocked all interaction.
• Add Lua call stack tracing: All Lua call sites now use xpcall + debug.traceback via SafeCall(), providing full Lua call stacks in developer console error output
• Improved error formatting: Dedicated LuaException handling in OutputException for cleaner developer console output; script paths passed to DoString for better error source identification

Closes #41

Test plan

• Load CodeTracker pack with Door Shuffle variant
• Verify door slot items are clickable and capture grid appears
• Verify regular items with IgnoreUserInput=true still block default click behavior
• Trigger a Lua error and verify the developer console shows a full Lua call stack

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