convert: when getting file from Perforce concatenate data at the end
As it turned out, even when getting relatively small files, concatenating string data every time when new chunk is received is very inefficient. Maintaining a string list of data chunks and concatenating everything in one go at the end seems much more efficient - in my testing it made getting 40 MB file 7 times faster, whilst converting of a particularly big changelist with some big files went down from 20 hours to 3 hours.
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