Fully qualify references to generated interfaces

[simonmckenzie]

This addresses an issue where, when a class references a generated interface, those references are not fully qualified, resulting in an interface that doesn't compile. See #87.

The change is to precalculate the list of interface names that will be generated, and, during symbol string generation, replace unrecognised symbols with generated names where a single unambiguous match can be made between the symbol and the list of interfaces being generated.

For the example provided in #87, the code will now generate this output:

//--------------------------------------------------------------------------------------------------
// <auto-generated>
//     This code was generated by a tool.
//
//     Changes to this file may cause incorrect behavior and will be lost if the code is regenerated.
// </auto-generated>
//--------------------------------------------------------------------------------------------------

namespace Test
{
    [global::System.CodeDom.Compiler.GeneratedCode("AutomaticInterface", "")]
    public partial interface ITest1
    {
        /// <inheritdoc cref="Test.Test1.Get(ITest2)" />
        void Get(global::Test.Tests.ITest2 test);
        
    }
}


//--------------------------------------------------------------------------------------------------
// <auto-generated>
//     This code was generated by a tool.
//
//     Changes to this file may cause incorrect behavior and will be lost if the code is regenerated.
// </auto-generated>
//--------------------------------------------------------------------------------------------------

namespace Test.Tests
{
    [global::System.CodeDom.Compiler.GeneratedCode("AutomaticInterface", "")]
    public partial interface ITest2
    {
    }
}

[simonmckenzie]

This is ready for review again - I just had a last minute refactoring idea :)

[ChristianSauer]

Could you be so kind and merge master into this? Than I will merge it as 6.x I think because it's potentially breaking

[simonmckenzie]

Not a problem @ChristianSauer. I hope to get this done next week.