Misc bugfixes

core/src/mindustry/content/Items.java

@@ -30,7 +30,7 @@ public class Items{
             cost = 1.5f;
         }};
 
-        graphite = new Item("graphite", Color.valueOf("95abd9")){{
+        graphite = new Item("graphite", Color.valueOf("b2c6d2")){{
             cost = 1f;
         }};
 

core/src/mindustry/game/Rules.java

@@ -230,7 +230,7 @@ public class Rules{
         /** If true, this team has infinite unit ammo. */
         public boolean infiniteAmmo;
 
-        /** Enables "RTS" unit AI. TODO wip */
+        /** Enables "RTS" unit AI. */
         public boolean rtsAi;
         /** Minimum size of attack squads. */
         public int rtsMinSquad = 4;

core/src/mindustry/input/InputHandler.java

@@ -592,6 +592,10 @@ public abstract class InputHandler implements InputProcessor, GestureListener{
             logicCutsceneZoom = -1f;
         }
 
+        if(commandBuild != null && !commandBuild.isValid()){
+            commandBuild = null;
+        }
+
         if(!commandMode){
             commandRect = false;
         }

core/src/mindustry/input/MobileInput.java

@@ -715,6 +715,7 @@ public class MobileInput extends InputHandler implements GestureListener{
         selectedUnits.removeAll(u -> !u.isCommandable() || !u.isValid());
 
         if(!commandMode){
+            commandBuild = null;
             selectedUnits.clear();
         }