Fix invalid IL in setters for non-blittable-value-type non-generic fi…

…elds

Strip Optional attribute off unstripped ICall delegates

Added PDB generator, added an option to specify additional assemblies…

…/namespaces to un-systemify

Bump versions, update changelog

Fix binary compatibility of ClassInjector

Re-bump version, update release notes and README

Support actual DefaultMemberAttribute in addition to AttributeAttribu…

…te with it

Bump version, update changelog

Fix crashes on Unity 2020.1+, update changelog

Use il2cpp_gc_wbarrier_set_field for field writes if it exists