Add new make targets

[roboyoshi]

I want to be able to build certain aspects of the filetree via the Makefile.

make base -> generates only up to 2 or 3 levels into the structure and excludes all files
make full -> generates the whole tree
make audio -> only generates the audio section
make video -> only generates the video section

• more

[roboyoshi]

I don't see this as necessary anymore. I create the whole tree and that's it. People can easily extract the relevant parts. Instead we have make targets for some common tooling, which is already added now.