Several fixes including SL compatibility with llGetObjectDetails for OPT_OTHER

[appurist]

Several fixes while I was in there looking at Linden plants:

• Fixes llGetObjectDetails calls with OBJECT_PATHFINDING_TYPE to return OPT_OTHER for Linden plants.
• Fixed handling of attempts to wear Linden plants that were rezzed in a region.
• Improved error handling related to attaching objects (may even fix ghost HUD issue) and objects ending up at 0,0,0

[appurist]

The PR was one logical (associated) set of changes. I had already explained privately why it was three separate commits.

The project is not set up for testing this functionality in automated tests. So I manually ensured full coverage by forcing each condition in the debugger, single stepping through the changes. In the future, I'd also like to see a SonarQube report on code quality differences on every commit. but I doubt I'll see that.

There's a big difference between a project with full-time developers and one with ad-hoc occasional volunteers providing fixes, especially where that is fixes to an existing code base with a decade and a half of grunge and code smells. Be careful setting restrictions on what fixes you'll accept, especially when you are the one asking those developers to help provide a fix. Especially if the restrictions are impractical or even unreasonable, such as suggesting commits that are making related, dependent changes be provided as separate PRs.