Introduce Config class, disable payload comp. by default
The Config is a global class that allows for run-time tuning of behaviour of Akonadi clients, like enabling or disabling payload compression, in future selecting compression algorithm and compression level and possibly more. At the same time this disables the payload compression feature by default (can be enabled via config) as LZMA is too slow and I failed to implement LZMA in time for 20.12.
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