Reintroduce and fix feature checks for "Cache full ISO in RAM" #20165
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Reverts #20158 .
Plus, adds proper feature checks this time, so that it'll work on desktop but won't be available at all on mobile. Previously the checkbox was there on mobile but did nothing. When it was fixed to work, some people faced out-of-RAM conditions, which is not good.
So, the checkbox and entire feature is now gone on mobile, but it's back again and working on PC/Mac/Linux desktops.