[MLA-1804] Update min version 2019.4#5166

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chriselion wants to merge 6 commits intomainfrom MLA-1804-min-version-2019.4

Commits on Mar 19, 2021

update package version
Chris Elion
committed
update Project to 2019.4
Chris Elion
committed
remove defines that are now always true
Chris Elion
committed

Commits on Mar 20, 2021

Update DevProject to 2020.3
Chris Elion
committed
update doc comment
Chris Elion
committed
changelog
Chris Elion
committed