start working on error handling stuff

platforms/cli/src/main/java/com/dfsek/terra/cli/block/CLIBlockState.java

@@ -64,17 +64,17 @@ public class CLIBlockState implements BlockState {
     }
 
     @Override
-    public BlockType getBlockType() {
+    public BlockType blockType() {
         return type;
     }
 
     @Override
-    public String getAsString(boolean properties) {
+    public String asString(boolean properties) {
         return value;
     }
 
     @Override
-    public boolean isAir() {
+    public boolean air() {
         return isAir;
     }
 

platforms/cli/src/main/java/com/dfsek/terra/cli/block/CLIBlockType.java

@@ -25,17 +25,17 @@ public class CLIBlockType implements BlockType {
     }
 
     @Override
-    public BlockState getDefaultState() {
+    public BlockState defaultState() {
         return defaultState.value();
     }
 
     @Override
-    public boolean isSolid() {
+    public boolean solid() {
         return solid;
     }
 
     @Override
-    public boolean isWater() {
+    public boolean water() {
         return water;
     }
 }

platforms/cli/src/main/java/com/dfsek/terra/cli/handle/CLIWorldHandle.java

@@ -1,5 +1,7 @@
 package com.dfsek.terra.cli.handle;
 
+import com.dfsek.terra.api.error.Invalid;
+import com.dfsek.terra.api.util.generic.data.types.Either;
 import org.jetbrains.annotations.NotNull;
 
 import com.dfsek.terra.api.block.state.BlockState;
@@ -16,8 +18,8 @@ public class CLIWorldHandle implements WorldHandle {
     }
 
     @Override
-    public @NotNull BlockState createBlockState(@NotNull String data) {
-        return new CLIBlockState(data);
+    public @NotNull Either<Invalid, BlockState> createBlockState(@NotNull String data) {
+        return Either.right(new CLIBlockState(data));
     }
 
     @Override