Create per-download maximum memory setting #2393
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Fixes #2377
Implements a new setting to limit memory used per download thread.
By default, the setting uses half of the system's available memory, split up between the available download threads.
Setting the limit to 0 will revert to the original behavior of using as much RAM as necessary.
This also removes a bunch of unused code related to settings, as well as settings classes that aren't used anymore.
The new setting: