Update nginx template
quieten down update-dcss-stream.py
Fix variable references in nginx config template
Fix variable ref in webtiles config.toml
Start managing webtiles & dgamelaunch
Add skeleton dgamelaunch
start managing webtiles & dgamelaunch
Lint & QoL improvements

* git fetch gets -q
* lockfile acquirement now uses advisory locks to better protect against
  race conditions (this is still not flawless, but hopefully not too
  difficult to understand).
* Add docstrings everywhere
* Move some exception handling that wrapped entire functions to where
  the function is called.
* Various other lint-detected issues