manually encode newlines on all printed commands

This way we group key value arguments: e.g.:

    make \
    -j 8 \
    all

instead of:

    make \
    -j \
    8 \
    all

and reach CLI nirvana, while also subtly breaking several commands due to
lack of testing.

gem5-shell

@@ -1,6 +1,5 @@
 #!/usr/bin/env python3
 
-import subprocess
 import sys
 
 import common
@@ -10,4 +9,8 @@ parser = common.get_argparse(
     argparse_args={'description':'Connect a terminal to a running gem5 instance'}
 )
 args = common.setup(parser)
-sys.exit(common.run_cmd([str(common.gem5_m5term), 'localhost', str(common.gem5_telnet_port)]))
+sys.exit(common.run_cmd([
+    common.gem5_m5term, common.Newline,
+    'localhost', common.Newline,
+    str(common.gem5_telnet_port), common.Newline,
+]))