Better handling of invalid PSI elements

There's still a need to rebuild caches & indices after a period of usage, typically due to an accumulation of invalid/stale PSI elements. Ideally I'd trace these invalid elements back to the source and fix that, but I've found that to be exceptionally difficult in some cases, particularly while caching things aggressively to maintain high-performance code completion, reference navigation, etc. Minimally I need to recognize these situations and evict/repopulate the corresponding cache entries based on current information.

For what it's worth to interested observers, this issue is really a placeholder for work I've been doing. I've already implemented the latter approach in many (most?) places and am seeing quite good results after large-scale changes such as metadata retrieval/refresh and OST regeneration.

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