Coding Standards: Upgrade WPCS to 1.0.0

WPCS 1.0.0 includes a bunch of new auto-fixers, which drops the number of coding standards issues across WordPress significantly. Prior to running the auto-fixers, there were 15,312 issues detected. With this commit, we now drop to 4,769 issues.

This change includes three notable additions:
- Multiline function calls must now put each parameter on a new line.
- Auto-formatting files is now part of the `grunt precommit` script. 
- Auto-fixable coding standards issues will now cause Travis failures.

Fixes #44600.


Built from https://develop.svn.wordpress.org/trunk@43571


git-svn-id: http://core.svn.wordpress.org/trunk@43400 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/index.php

@@ -124,7 +124,7 @@ if ( has_action( 'welcome_panel' ) && current_user_can( 'edit_theme_options' ) )
 	if ( $hide ) {
 		$classes .= ' hidden';
 	}
-		?>
+	?>
 
 	<div id="welcome-panel" class="<?php echo esc_attr( $classes ); ?>">
 		<?php wp_nonce_field( 'welcome-panel-nonce', 'welcomepanelnonce', false ); ?>