There are some user complaints that Imager hangs at "writing 0%"
Mention in the progress status what it is actually doing prior
to writing (e.g. opening storage, blkdiscarding,
zero'ing out MBR, starting download) to help diagnose
potential issues.
Modern CPUs have special instructions to accelerate computing
SHA hashes.
The Qt QCryptographicHash code is standard C, so not taking
advantage of those though.
Outsource the hashing to OpenSSL that does.
Shaves off some seconds during verification stage.
- Use larger buffer size when writing uncompressed files
(was libcurl's default of 16 kb, change it to 128 kb)
- Uncompress the next MB of data, while it is hashing/writing to
disk in seperate thread.
