AV2400: Formatting of expression bodied members and dictionary initializers

[bkoelman]

Existing rule:

Use a common layout (AV2400)
Then follows a bulleted list for formatting rules...

New language features to consider:

• dictionary initializers
  We can update the existing example for object/collection initializers to:

var dto = new ConsumerDto
{
    Id = 123,
    Name = "Microsoft",
    PartnerShip = PartnerShip.Gold,
    ShoppingCart =
    {
        ["VisualStudio"] = 1
    }
};

Changes: remove () on first line; add dictionary initializer; add missing semicolon at end; correct casing of "object Initializers" in bullet text

• expression bodied members
  The default settings of Resharper (current version at the time of writing is v2017.2.2) break long lines after the arrow. Example:

private string GetLongText =>
    "ABC ABC ABC ABC ABC ABC ABC ABC ABC ABC ABC ABC ABC ABC ABC ABC ABC ABC ABC ABC ABC";

I propose to add an extra bullet for that formatting.

Additional notes:

• "Don't indent lambda statements..." should be: "Don't indent lambda statement blocks..."