backport some 2.6.0 changes

* Empty ceramic buckets cannot interact any longer with tanks with less than 1000mb. (#53 fixed)
* Filled ceramic buckets cannot interact with tanks with less than 1000mb empty space.
* change pike texture of Upgrade Aquatic mod #50

gradle.properties

@@ -3,7 +3,7 @@
 org.gradle.jvmargs=-Xmx3G
 org.gradle.daemon=false
 
-mod_version=2.5.5
+mod_version=2.6.0
 minecraft_version=1.15.2
 
 forge_version=1.15.2-31.1.75

src/main/java/cech12/ceramicbucket/compat/UpgradeAquaticCompat.java

@@ -26,6 +26,7 @@ public UpgradeAquaticCompat() {
         this.addFish("immortal_jellyfish");
         this.addFish("lionfish");
         this.addFish("nautilus");
+        //this.addFish("perch"); //added in 1.16
         this.addFish("pike");
         this.addSquid();
     }

src/main/java/cech12/ceramicbucket/item/CeramicBucketFluidHandler.java

@@ -19,4 +19,12 @@ protected void setFluid(FluidStack fluid) {
         this.container = CeramicBucketUtils.getFilledCeramicBucket(fluid.getFluid(), this.container);
     }
 
+    @Override
+    public int fill(FluidStack resource, FluidAction doFill) {
+        //only fill the bucket, if there is enough fluid to fill the bucket completely
+        if (resource.getAmount() < FluidAttributes.BUCKET_VOLUME) {
+            return 0;
+        }
+        return super.fill(resource, doFill);
+    }
 }

src/main/java/cech12/ceramicbucket/item/FilledCeramicBucketFluidHandler.java

@@ -22,6 +22,10 @@ protected void setContainerToEmpty() {
     @Nonnull
     @Override
     public FluidStack drain(int maxDrain, FluidAction action) {
+        //only drain the bucket, if there is enough space to drain the bucket completely
+        if (maxDrain < FluidAttributes.BUCKET_VOLUME) {
+            return FluidStack.EMPTY;
+        }
         //consider infinity enchantment
         if (action == FluidAction.EXECUTE
                 && CeramicBucketUtils.isAffectedByInfinityEnchantment(this.container)) {