Decrease Engineer, Medic and Mechanic priority

Fixes the issue that engineers would just run straight at the target while
mixed with a group and attack moved.

mods/cnc/rules/infantry.yaml

@@ -148,6 +148,8 @@ E6:
 		CaptureTypes: building, husk
 	-AutoTarget:
 	-GainsExperience:
+	Selectable:
+		Priority: 5
 
 RMBO:
 	Inherits: ^Soldier

mods/d2k/rules/infantry.yaml

@@ -47,6 +47,8 @@ engineer:
 	-AutoTarget:
 	Voiced:
 		VoiceSet: EngineerVoice
+	Selectable:
+		Priority: 5
 
 trooper:
 	Inherits: ^Infantry

mods/ra/rules/infantry.yaml

@@ -182,6 +182,8 @@ E6:
 	-AutoTarget:
 	Voiced:
 		VoiceSet: EngineerVoice
+	Selectable:
+		Priority: 5
 
 SPY:
 	Inherits: ^Soldier
@@ -320,6 +322,8 @@ MEDI:
 		AttackSequence: heal
 	Voiced:
 		VoiceSet: MedicVoice
+	Selectable:
+		Priority: 5
 
 MECH:
 	Inherits: ^Soldier
@@ -357,6 +361,8 @@ MECH:
 		StandSequences: stand
 	Voiced:
 		VoiceSet: MechanicVoice
+	Selectable:
+		Priority: 5
 
 EINSTEIN:
 	Inherits: ^CivInfantry

mods/ts/rules/gdi-infantry.yaml

@@ -54,6 +54,8 @@ MEDIC:
 		Ticks: 60
 	Passenger:
 		PipType: Red
+	Selectable:
+		Priority: 5
 
 JUMPJET:
 	Inherits: ^Soldier

mods/ts/rules/nod-vehicles.yaml

@@ -162,6 +162,8 @@ REPAIR:
 		ForceTargetStances: None
 	AttackFrontal:
 		Voice: Attack
+	Selectable:
+		Priority: 5	
 
 WEED:
 	Inherits: ^VoxelTank

mods/ts/rules/shared-infantry.yaml

@@ -64,3 +64,5 @@ ENGINEER:
 		FactionImages:
 			gdi: engineer.gdi
 			nod: engineer.nod
+	Selectable:
+		Priority: 5