Add hooks to gdb app runner process

The main nuvolaplayer binary runs app runner process in gdbserver.

Added set_up_env.sh helper functions.

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>
Don't warn when web worker process isn't ready yet

Only show debugging message.

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>