Add race-specific icons for common abilities

src/main/java/com/minelittlepony/unicopia/ability/EarthPonyKickAbility.java

@@ -31,6 +31,7 @@ import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.item.ItemStack;
 import net.minecraft.predicate.entity.EntityPredicates;
 import net.minecraft.server.world.ServerWorld;
+import net.minecraft.util.Identifier;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.math.Box;
 import net.minecraft.util.math.Vec3d;
@@ -57,6 +58,14 @@ public class EarthPonyKickAbility implements Ability<Pos> {
         return race.canUseEarth();
     }
 
+    @Override
+    public Identifier getIcon(Pony player) {
+        Identifier id = Abilities.REGISTRY.getId(this);
+        return new Identifier(id.getNamespace(), "textures/gui/ability/" + id.getPath()
+            + "_" + player.getObservedSpecies().getId().getPath()
+            + ".png");
+    }
+
     @Override
     public double getCostEstimate(Pony player) {
         return TraceHelper.findBlock(player.asEntity(), getKickDirection(player) * 6, 1)

src/main/java/com/minelittlepony/unicopia/ability/EarthPonyStompAbility.java

@@ -27,6 +27,7 @@ import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.item.ItemStack;
 import net.minecraft.registry.tag.BlockTags;
 import net.minecraft.server.world.ServerWorld;
+import net.minecraft.util.Identifier;
 import net.minecraft.util.math.BlockBox;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.math.Box;
@@ -61,6 +62,14 @@ public class EarthPonyStompAbility implements Ability<Hit> {
         return race.canUseEarth();
     }
 
+    @Override
+    public Identifier getIcon(Pony player) {
+        Identifier id = Abilities.REGISTRY.getId(this);
+        return new Identifier(id.getNamespace(), "textures/gui/ability/" + id.getPath()
+            + "_" + player.getObservedSpecies().getId().getPath()
+            + ".png");
+    }
+
     @Override
     public double getCostEstimate(Pony player) {
         return rad;

src/main/java/com/minelittlepony/unicopia/ability/PegasusFlightToggleAbility.java

@@ -45,7 +45,7 @@ public class PegasusFlightToggleAbility implements Ability<Hit> {
         Identifier id = Abilities.REGISTRY.getId(this);
         return new Identifier(id.getNamespace(), "textures/gui/ability/" + id.getPath()
             + (player.getPhysics().isFlying() ? "_land" : "_takeoff")
-            + (player.getObservedSpecies() == Race.CHANGELING ? "_changeling" : "")
+            + "_" + player.getObservedSpecies().getId().getPath()
             + ".png");
     }