Simplify Keys and ResultMap structs#2

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luisjakon wants to merge 11 commits intoandy9775:masterfrom

luisjakon:master

Commits on Nov 29, 2019

Commits on Nov 30, 2019

Fix bug with Keys.RawKeys() + Keys.StringKeys() generation
luisjakon
committed

Commits on Dec 2, 2019

Fix skip duplicates on Keys.Append(...)
luisjakon
committed

Commits on Dec 3, 2019