Symbol resolution issues after upgrading to 2021.1

Opening this as a placeholder so that folks encountering this issue have a clear path to the underlying JetBrains issue and knowledge of the workaround required until it's resolved.

It appears that the 2021.1 release of the JetBrains IDEs has an issue with how core indices are tracked and updated, and they can become stale. This affects all JetBrains IDEs/languages/plugins that rely on file-based indices, not just Illuminated Cloud, and it's being tracked by JetBrains here (with MANY duplicates merged into this one):

https://youtrack.jetbrains.com/issue/IDEA-266391

The fix has already been committed, and as I understand it, a 2021.1.1 patch should be issued very soon.

In the interim if you see strange behavior, in particular things that should resolve just fine not resolving properly, you can use File>Invalidate Caches to rebuild all caches and indices to work around this issue.

Again, hopefully the need for this workaround will be very short-lived, but I wanted to make IC2 users aware of this until the patch has been issued.

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