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Changelog

Fix FullTracer depth based on previous context (prevCTX) and use global depth in opcode depth. Also delete old increase/decrease depth detection code.
Encode process batch response in executor service to reduce the size of the response: delete unnecessary zeros in storage and stack, send step memory increments starting at memory_offset
Avoid copies when generating FullTracer execution_trace and call_trace, by reserving vector space, using emplace_back() instead of push_back(), and swapping vectors instead of assigning their contents (copy)
Move memory encoding from executor service (response generation) to executor (data generation) to reduce the memory requirements
Fix OOCS errors wrongly detected by executor when no_counters is set
Fix DatabaseCache memory leak
Fix Prover destructor minor memory leak