Automatic Round-start Access Scaling

- Added a new config option MINIMAL_ACCESS_THRESHOLD that can be used to automatically give players more access during low-pop rounds.
- If the number of players is below this threshold, expanded access will be used and security and assistants will have maintenance access.
- If the number of players exceeds the threshold, minimal access will be used and security and assistants will not have maintenance access.
- Setting the threshold to 0 will disable this function, and server ops can set the state of round-start access manually

code/controllers/subsystem/jobs.dm

@@ -211,6 +211,15 @@ var/datum/subsystem/job/SSjob
 	//Scale number of open security officer slots to population
 	setup_officer_positions()
 
+	//Jobs will have fewer access permissions if the number of players exceeds the threshold defined in game_options.txt
+	if(config.minimal_access_threshold)
+		if(config.minimal_access_threshold > unassigned.len)
+			config.jobs_have_minimal_access = 0
+			config.jobs_have_maint_access = 3 //Sec and Assistants get maint access
+		else
+			config.jobs_have_minimal_access = 1
+			config.jobs_have_maint_access = 0 //Sec and Assistants don't get maint access
+
 	//Shuffle players and jobs
 	unassigned = shuffle(unassigned)
 
@@ -335,6 +344,7 @@ var/datum/subsystem/job/SSjob
 	H << "<b>To speak on your departments radio, use the :h button. To see others, look closely at your headset.</b>"
 	if(job.req_admin_notify)
 		H << "<b>You are playing a job that is important for Game Progression. If you have to disconnect, please notify the admins via adminhelp.</b>"
+	H << "<FONT color='blue'><B>As this station was initially staffed with a [config.jobs_have_minimal_access ? "full crew, only your job's necessities" : "skeleton crew, additional access"] have been added to your ID card.</B></font>"
 
 	H.update_hud() 	// Tmp fix for Github issue 1006. TODO: make all procs in update_icons.dm do client.screen |= equipment no matter what.
 	return 1