C#: Fix DB inconsistencies with extends/2#2293

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calumgrant:cs/extends-object

Commits on Dec 11, 2019

C#: Do not extend Object in extends/2. This is because Roslyn will incorrectly give a base class of 'Object' when a base type is missing, which is often incorrect and can lead to db inconsistencies.
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C#: Address review comment
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