Remove most doxygen file-level commands, copyrights, and authors

Remove the \file directive, as it is always superfluous  because the
current file is implicit [1]:

> If the file name is omitted (i.e. the line after \file is left blank)
> then the documentation block that contains the \file command will belong
> to the file it is located in.

Author names and e-mails are not relevant for us: it can always be
inferred from git blame, and is often outdated.

Eurecom code has been contributed and was under OAI PL v1.0/v1.1.

For the cpack package contact: put generic email address that is
independent of an individual and that will remain reachable.

[1] https://www.doxygen.nl/manual/commands.html#cmdfile

cmake_targets/at_commands/CMakeLists.txt

@@ -19,8 +19,6 @@
 # *      contact@openairinterface.org
 # */
 
-# Author: Lionel GAUTHIER
-
 cmake_minimum_required(VERSION 2.8)
 set(CMAKE_VERBOSE_MAKEFILE ON)
 

cmake_targets/build_oai

@@ -22,7 +22,6 @@
 
 # file build_oai
 # brief OAI automated build tool that can be used to install, compile, run OAI.
-# author  Navid Nikaein, Lionel GAUTHIER, Laurent Thomas
 
 set -e
 

cmake_targets/tools/build_helper

@@ -21,7 +21,6 @@
 
 # file build_helper
 # brief
-# authors Laurent Thomas, Lionel GAUTHIER
 #
 #######################################
 if [ ! -f /etc/os-release ]; then