refactor: use context managers whenever to manage resources #185
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Tested on SteamOS (3.16.13) and on the latest Steam beta client (1726256783) for regressions.
This PR refactors some code to use context managers whenever possible, so system resources are properly released when the launcher is forcefully killed any time in its lifecycle. In particular, when the launcher is interrupted before the thread pool is shutdown or before the file descriptors of python-xlib objects are closed during the gamescope window setup.
TODO: