Fix entrypoint hanging when launcher crashes

[mitchpk]

These changes allow the entrypoint to terminate if the Northstar launcher crashes, allowing proper auto-restart functionality with docker-compose. Since sendTerminate(true) is deferred to the end of n.Run(), extra calls within Run() are not required. Also, initialising Xrdb now removes old lock files, which in my case were preventing the docker container from restarting successfully.

[mitchpk]

Turns out this change brings other issues to light, at the moment I am looking at why the watchdog is not receiving updates for the window title and therefore stopping the server:

watchdog: triggered (watchdog did not receive a title update in time: last tick was 5.000093142s ago); killing server
Error: Failed to run server: watchdog did not receive a title update in time

From what I have experienced, the NorthstarLauncher window title may not update when loading a map which causes the watchdog to believe the server is frozen.

[mitchpk]

I have increased the watchdog timeout from 5 seconds to 1 minute, which is enough time for the launcher to update its title after loading a new map. Also, the PTY no longer outputs double newlines caused by converting "\r\n" to "\n\n".

[pg9182]

Looks good, thanks!