Themes are not found when package is consumed by Cake.Frosting project

[mgnslndh]

Problem

When the package is consumed by a Cake.Frosting project the Cake.MarkdownToPdf.dll is copied to the project's bin target directory. When the theme path is resolved it will use the assembly's location as the base directory but it will not find any themes because they are still in the user's NuGet cache.

Proposition

I can think of at least two ways of solving this. Not sure which one is best or if there is a better way of doing this.

1. Use either NuGet conventions or a .targets file to make sure that the themes are copied to the same location as the assembly.
2. Change the theme resolution to also look in the user's NuGet cache

Would you consider a PR fixing this?

[mgnslndh]

I guess option 2 is not that good since it would only work when you build and run.