Refactor FieldDef to model presense as an enum rather than 2 bools.#6420

Merged

aardappel merged 9 commits intogoogle:masterfrom

Jan 25, 2021

Commits on Jan 23, 2021

Define presence.
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Migrate to IsRequired and IsOptional methods
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moved stuff around
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Removed optional and required bools from FieldDef
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change assert to return error
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Commits on Jan 24, 2021

Fix tests.cpp
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MakeFieldPresence helper
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fmt
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old c++ compatibility stuff
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