Updated nuspec files.

Delete FindNuGetTests.cs (simple-odata-client#831)

Removed tests due NuGET OData API deprecation:
Link: https://aka.ms/nuget/odata-deprecation

Merge branch 'lscorcia-issue-818'

Correct versions of dependent packages.

Correct versions of dependent packages.

Added static member support to MemberAccessor and added tests.

Updated NuGet packages.

Merge branch 'NilsEngelbach-feature/122-relative-urls-in-batch-payload'

Merge branch 'maxbruecken-fix-evaluation-of-constant-expression-conta…

…ining-mapped-properties'

Merge branch 'maxbruecken-negate-in-operator'