…socket for create file operation

…d mode, when content-length attribute is not available

…ing abbreviated notations b,kb,Mb,Gb (and corresponding binary powers notations B,kB,MB,GB); add option --seed=SEED for deterministic file content generation

…r PRNG) for creating random files (in that case, string seed is expected to be received immediately after creation strategy byte)

…supported

…reation strategy byte, one for supplying custom seed (& 4) and one for enabling output hash (& 8)

…uting hashes of regular files in cli mode (1 consumer thread spawned and joined for each file hashed) - this helps to saturate read throughput of slow/high-latency drives e.g. cheap pen drives or old hard disks; add readTill method to IDescriptor.h

…/x64 cpus; use AES accordingly when those instructions are present, in createRandomFile

…on ARMv8 arch, in favor of the ChaCha20 cipher which is way more performant; on PC x86/x64 instead, detect AES-NI instructions and use them if present, since throughput is higher in that case

…ile generation in both cli and standard mode

…sh (1 producer, 2 consumers), and enable its usage in cli mode

…ctly invoke configure (and enable armv8 extensions) when armv8 target is selected