Allow markers to be used as light sources (#9733)

* Allow markers to be used as light sources

* Better light source markers

* Move PointMarker drawLight to LightMarker

* Add a rule for unit lights

* Optimize marker rendering

* Update core/assets/bundles/bundle.properties

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Co-authored-by: Anuken <arnukren@gmail.com>

core/src/mindustry/game/Rules.java

@@ -180,6 +180,8 @@ public class Rules{
     public boolean lighting = false;
     /** Ambient light color, used when lighting is enabled. */
     public Color ambientLight = new Color(0.01f, 0.01f, 0.04f, 0.99f);
+    /** Whether units produce light when lighting is enabled. */
+    public boolean unitLight = true;
     /** team of the player by default. */
     public Team defaultTeam = Team.sharded;
     /** team of the enemy in waves/sectors. */