We originally used libcurl for both downloading images from
Internet and reading local files to have the same code path for both.
It doesn't work that well in practice, as Qt and libcurl are not
on the same page how special characters such as Chinese characters
are represented in a local file URL.
So create a new class to handle local files.
Closes#76
- Allow static build
- Use .svg icons
- Linux Embedded lacks normal "open file dialog". So simply scan
files in root folder of USB stick and return list.
- Change QProcess::execute(command) calls to
QProcess::execute(command, args) calls to silence Qt 5.15.0
depreciation warning.
Append "rpi-imager/version-num" to the default User-Agent when curl is
downloading the image so that image hosts can more easily distinguish
rpi-imager traffic from other traffic.
- 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.
