9b8001f370
This commit allows re-entrant calls to `BKE_layer_collection_resync_forbid` and `BKE_layer_collection_resync_allow`, such that higher-level code can block layer collections updates while calling lower-level code that does the same thing. E.g. `BKE_id_delete` blocks and then re-allows such updates. However, such code can also be called from other pieces of code that also need to prevent these updates in their own, broader scope. In addition, realized that this call had concurrency issues since BKE code using it is called from non-main thread too (e.g. from depsgraph evaluation). So made the counter atomic to ensure all calls to `BKE_layer_collection_resync_forbid` is matched by a call to `BKE_layer_collection_resync_allow`. Also added a cap to max amount of 're-entrant' calls (has to be quite high, due to potential concurrent calls too). This is required to fix #124777.
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