ChdFileReader: implement precaching of CHD files within PCSX2 instead of modifying libchdr #12086
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Description of Changes
Removes the patches applied to libchdr, and instead uses libchdr's virtual IO API to achieve the same behaviour.
Rationale behind Changes
Such patches can be missed when updating dependencies, potentially leading to difficulty updating.
We now also precache parent CHD files, which the patched libchdr did not.
Includes on #12075
Suggested Testing Steps
Test precaching using CHD files