Enumify Flags in HasFlag/SetFlag Extension Methods

[hf-kklein]

BO4E-dotnet/BO4E-dotnet/BO/BusinessObject.cs

Line 205 in 8bba8b1

public bool HasFlagSet(string flagKey)

In an ideal world, the methods for setting/nulling/reading flags should only accept Enum-Values (bonus: only those with an Flags-Attribute).
ToDo: Make the public method generic enough to consume only enums, not strings. The internal/private methods might still use strings because, as the flags are stored in a Dictionary<string,JToken> (constraint by JSON.Net), the keys are ultimately stored as strings in the UserProperties.