Move Namecoin launcher from Bash launcher to Tor Launcher

Currently, Namecoin is launched by the Bash launcher. This is non-ideal for a couple reasons:

1. The Bash launcher is only a thing on GNU/Linux targets; this blocks tor-browser-build#40022 (closed) and tor-browser-build#40024 (closed) .
2. The Bash launcher doesn't get re-executed when an update is installed, causing tor-browser-build#40023 (closed) .

It would probably make more sense to launch Namecoin as part of Tor Launcher, in the same way that the Tor daemon is launched.