libsocket : Updated sockets to add poll function, also added wrappers for external use

Signed-off-by: Lucas Bajolet <lucas.bajolet@hotmail.com>
stdlib : AbstractString/String, Added trim function and unit test

Signed-off-by: Lucas Bajolet <lucas.bajolet@hotmail.com>
nitdbg : Added remote debugger to nit standard make program

Signed-off-by: Lucas Bajolet <lucas.bajolet@hotmail.com>