[csharp][default] Fix handling of nested inheritance properties#8875

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Blackclaws wants to merge 4 commits intoOpenAPITools:masterfrom

Blackclaws:csharp-inheritance-fix

Commits on Mar 3, 2021

allDefinitions contains the schema names not the model names, if they are different no match will happen
Blackclaws
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Fix adding properties in case of a composed schema
Blackclaws
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Commits on Mar 11, 2021

Merge branch 'master' into csharp-inheritance-fix
Blackclaws
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Commits on Mar 12, 2021

Add comments and get rid of one superfluous variable
Blackclaws
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