Patch "unserialize untrusted data" rebased onto latest release#1

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tribut wants to merge 5 commits intorelease-6.2.27from release-unserialize-untrusted-data

+73-15

Commits on Feb 25, 2022

Allow only trusted classes in unserialize

xgin
authored and
tribut
committed
Use json for serialization

xgin
authored and
tribut
committed

Commits on Mar 3, 2022

Commits on Mar 4, 2022

Add missing IMP_Flag_System_ flags to allowlist
tribut
committed