Add support for ALDA 2 in the decompiler and importer

[truj]

There are some slight syntax differences between ALDA 1 and 2. The decompiler was made before ALDA 2 came out. Also the CLI might be different.

• [ ] Check if the decompiler still works with ALDA 2 (I'm pretty sure that's not the case)
• [ ] Add ALDA 2 support in the decompiler
• [ ] Add ALDA 2 support in the importer (probably necessary as well)

Maybe it's easy enough to support both versions. But if that's too much overhead, it should be ok to skip ALDA 1 support at all. I guess most people won't use it any more.