16 commits since v5.4.9

Changelog (excluding merges):
* (63778da) [ghorsington] Use BepInPlugin to check for plugin existence instead of BaseUnityPlugin
* (e556272) [ghorsington] Bump version
* (73b91f8) [ghorsington] Don't apply HideAndDontSave by default; add HideManagerGameObject config
* (61bc728) [ghorsington] Update BepInEx.Harmony
* (d5d9c5c) [ghorsington] Bump version
* (ac6d65d) [ghorsington] Update README
* (0ae9c0c) [ghorsington] Update BepInEx.Harmony
* (080b111) [ghorsington] Bump HarmonyX and MonoMod
* (b6ebed8) [ghorsington] Update BepInEx.Harmony
* (80c2ea8) [ghorsington] Update Doorstop.Unix
* (78ad6a0) [Ash] Update WindowsConsoleDriver to reuse Utility.UTF8NoBom
* (352ae3c) [Ash] Remove BOM from log and config files
* (26c49f9) [ghorsington] Enhance headless mode check
* (a0900ad) [Kein] Update MainManager GO to use "HideAndDontSave"
* (3b25865) [Kein] Update ThreadingHelper GO to use "HideAndDontSave"