Tidies up namespace declarations

The values are still unknown and the function is still considered a stub.
Puyo Puyo Tetris now tries to call fsp-srv:MountSaveData.

* Add AppletAE, step 1: move common interfaces to am.h

* Add AppletAE, step 2

It'll be needed when we implement CreateManagedDisplayLayer.

This has a huge fallout in terms of needing to fix other files because
all service implementations included that file.

Updated based off information from 3dbrew.

This makes clang-format useful on those.

Also add a bunch of forgotten transitive includes, which otherwise
prevented compilation.

Named the service functions in am:app as per 3dbrew.

This fixes an illegal read loop in Steel Diver