Mark generated files with a comment?

[quasilyte]

It looks like _aot_generated/* files were generated (I tried a quick search, but mostly cmake/make files were showing up, so I am unsure what generated them at this point).

A comment might look like this:

// Code generated by <command>! DO NOT EDIT.

Where <command> is an actual command/script that was responsible for this file.

(This is a Go's standard format ^// Code generated .* DO NOT EDIT\.$)

This solves 2 issues:

1. It will be easier to find the code that generates these files
2. The editor will warn on an editing attempt on these files (and maybe we can filter-out those results from the global search if plugin helps a bit here)

[aleksisch]

I think that's a good idea.

Currently we have 2 ways to generate them:

1. Old path: using cpp transpiler, located at src/ast/ast_aot_cpp.cpp. This one can be called like ./bin/daslang -aot in.das out.cpp
2. New one, written on das located at: utils/aot/main.das.

Old one will be removed soon, and this command (./bin/daslang -aot in.das out.cpp) will redirect to new way. Anyway both files should be changed.

In CMake we have macro DAS_AOT_EXT to aot das file to cpp.