MDL-43506 Blocks: Remove deprecated _add_edit_controls
MDL-43506 Blocks: Remove deprecated _print_block
MDL-43506 Blocks: Remove deprecated _print_shadow
MDL-43506 Blocks: Remove deprecated _title_html
MDL-43506 Blocks: Remove deprecated _config_print
MDL-43506 Blocks: Remove deprecated instance_config_print
MDL-43506 Blocks: Remove deprecated constants
MDL-43506 Blocks: Remove deprecated blocks_get_missing
MDL-43506 Blocks: Remove deprecated blocks_delete_all_on_page