Add support for .avdl files

[senjin-hajrulahovic]

Please answer these questions before submitting your issue. Thanks!

What is your configuration, please give as much details as possible ?

I have .avdl files which I would like to use to check compatibility during build time.

Does this issue reproduce with the latest release ?

What did you do ?

If possible, provide a recipe for reproducing the error.

What did you expect to see ?

What did you see instead ?