yarpdataplayer closes immediately after loading data with --hidden flag is used

[arrenglover]

Describe the bug
immediately after loading data in the yarpdataplayer when the --hidden flag is used, the yarpdataplayer closes. The data is successfully loaded, but then the application exits.

To Reproduce
each command in a separate terminal:

yarpserver --write
yarpdataplayer --hidden
echo "load /home/aglover/data/attention/exp1/" | yarp rpc /yarpdataplayer/rpc:i

Expected behavior
using the same steps, but using yarpdataplayer without the --hidden flag successfully loads the data and the application stays open. I would expect the --hidden version to also stay open.

Configuration (please complete the following information):

• OS: Windows 10 19042 + ubuntu 20.04 on WSL2
• yarp version: 3.4.1
• compiler:

-- CMake: 3.16.3 (/usr/bin/cmake)
-- C Compiler: GNU 9.3.0 (/usr/bin/cc)
-- CXX Compiler: GNU 9.3.0 (/usr/bin/c++)

[vtikha]

This has been resolved in the full refactoring as discussedi in #2400 . The PR can be found here done: here
cc @arrenglover