Allow short member names for static resolvers

[Govorunb]

Changes static resolvers to attempt to resolve on the property's owner type if given a member name without the . separator.

This adds a bit of QoL by removing the need to fully qualify the name of the static member if it's being referenced by a property under the exact same type.

For example:

namespace Some.Long.Namespace
{
    public class Example : ScriptableObject
    {
        // old
        // [Dropdown("Some.Long.Namespace.Example.GetDropdown")
        // new
        [Dropdown(nameof(GetDropdown))]
        public string example;

        private static TriDropdownList<string> GetDropdown()
        {
            // ...
        }
    }
}