Remove unnecessary build files, disable harvesting of solid walls, cleanup

Author: robotgryphon

src/main/java/com/robotgryphon/compactmachines/block/walls/SolidWallBlock.java

@@ -31,6 +31,11 @@ public void onBlockExploded(BlockState state, World world, BlockPos pos, Explosi
         // NO-Op, do not destroy on explosions
     }
 
+    @Override
+    public boolean canHarvestBlock(BlockState state, IBlockReader world, BlockPos pos, PlayerEntity player) {
+        return false;
+    }
+
     @Override
     public boolean canEntityDestroy(BlockState state, IBlockReader world, BlockPos pos, Entity entity) {
         return false;