[Add] Added a few more ambient tracks.

snd/music.lua

@@ -40,7 +40,15 @@ function choose(str)
     music.play()
 
   elseif str == "ambient" then
-    ambient = { "peace1", "mission", "peace2", "peace4", "peace6" }
+    sys = space.getSystem()
+    factions = sys:faction()
+
+    if factions["Collective"] then
+      ambient = { "collective1" }
+    else
+      ambient = { "ambient1", "ambient2", "mission",
+                  "peace1", "peace2", "peace4", "peace6" }
+    end
     music.load(ambient[rnd.int(1, #ambient)])
     music.play()