Various fixes related to Appstream data installation and ZSTD support #695
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When the decompression finished, there can still be some data written to the output buffer. Without passing it over, the output can be cut.
The dash (`-`) is used in the appstream generated files, thus expect it. Related to ximion#683
Some parts of the code know of `.yaml*`, but this one knows only about `.yml*`.
The code knows of .yml* and .yaml* variants on various places, this one was only missing. This fixes also a bug, when the YAML file was not compressed, it was treated as XML.
The repo data can be compressed with ZSTD, thus teach the as_utils_install_metadata_file() what to do with these files.
The as_utils_install_metadata_file() can install the .xml* data re-saved, with added origin reference. When it does so, and the original file was compressed, then the file name extension does not reflect the file content anymore (it's a pure XML after re-saving, not a compressed XML data). That can confuse the Appstream data readers, thus rename the file to be .xml, to avoid this problem.
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There is already the ZSTD compression support built in, but it was not extended into the appstream data installation, which is the place the code will reach it first, because the ZSTD can be used in the repositories.
See the respective commits for the various fixes done along the way.