Adds a Visiting Officer (Observer) preset (#6330)

# About the pull request

Subtype of CO preset, this allows staff to spawn people in as visiting
officers without having to rename things constantly, and reduces
confusion from there being multiple people called Commanding Officer.


# Changelog
:cl:
add: Adds USCM Observer preset, a copy of CO with a different name.
/:cl:

code/__DEFINES/job.dm

@@ -119,6 +119,7 @@ GLOBAL_LIST_INIT(job_command_roles, JOB_COMMAND_ROLES_LIST)
 
 #define JOB_MARINE "USCM Marine" //generic marine
 #define JOB_COLONEL "USCM Colonel"
+#define JOB_USCM_OBSV "USCM Observer"
 #define JOB_GENERAL "USCM General"
 #define JOB_ACMC "Assistant Commandant of the Marine Corps"
 #define JOB_CMC "Commandant of the Marine Corps"

code/game/jobs/job/special/uscm.dm

@@ -1,5 +1,7 @@
 /datum/job/special/uscm/colonel
 	title = JOB_COLONEL
+/datum/job/special/uscm/observer
+	title = JOB_USCM_OBSV
 /datum/job/special/uscm/general
 	title = JOB_GENERAL
 /datum/job/special/uscm/acmc

code/modules/gear_presets/uscm_ship.dm

@@ -469,6 +469,16 @@
 
 //*****************************************************************************************************/
 
+/datum/equipment_preset/uscm_ship/commander/visitor
+	name = "USCM Observer (Major) (VO)"
+	flags = EQUIPMENT_PRESET_EXTRA
+
+	assignment = JOB_USCM_OBSV
+	rank = JOB_USCM_OBSV
+	role_comm_title = "VO"
+
+//*****************************************************************************************************/
+
 /datum/equipment_preset/uscm_ship/commander/council
 	name = "USCM Commanding Officer (CO+)"
 	flags = EQUIPMENT_PRESET_START_OF_ROUND|EQUIPMENT_PRESET_MARINE