Blender Git Loki

Fix part of T89313: Attribute search crash during animation playback

During animation playback, data-blocks are reallocated, so storing
pointers to the resulting data is not okay. Instead, the data should
be retrieved from the context. This works when the applied search
item is the "dummy" item added for non-matches. However, it still
crashes for every other item, because the memory is owned by the
modifier value log, which has been freed by the time the exec function
runs.

The next part of the solution is to allow uiSearchItems
to own memory for the search items.