Added "Disable Seasonal Events" startup variable and updated the startup command to add the new flag `-DisableSeasonalEvents` if the variable is "true". This new flag was added to Satisfactory in 0.5.1.4 (https://satisfactory.fandom.com/wiki/Patch_0.5.1.4).
As it starts with a password protected admin user on startup anyway, the majority of usecases would benefit from having authentication enabled by default
"Max Players" var was defined as MAXPLAYERS, but referred as MAX_PLAYERS. Changed the definition instead of the startup command to keep it consistent with other steam games.