Wordpress: Enable SVG in Media; Fix slug conflict of attachments and posts; Redirect media to files

functions.php

// Allow SVG in Media
function cc_mime_types($mimes) {
 $mimes['svg'] = 'image/svg+xml';
 return $mimes;
}
add_filter('upload_mimes', 'cc_mime_types');

// Redirect media pages to source files
add_action( 'template_redirect', 'test_attachment_redirect', 10 );
function test_attachment_redirect() {
    if( is_attachment() ) {
        $url = wp_get_attachment_url( get_queried_object_id() );
        wp_redirect( $url, 301 );
    }
    return;
}

// Change the slug of attachments to resolve conflict with pages or posts
add_filter( 'wp_unique_post_slug', 'wpse17916_unique_post_slug', 10, 6 );
function wpse17916_unique_post_slug( $slug, $post_ID, $post_status, $post_type, $post_parent, $original_slug ) {
  if ( 'attachment' == $post_type )
    $slug = $original_slug . uniqid( '-' );
  return $slug;
}

// Fix existing conflicts of slugs with attachments
function wp21418_append_to_post_name() {

    // Checks to see if the option images_updated has been set or has a value of true.
    if ( get_option( 'images_updated' ) === 'true' ) :
        return;
    endif;

    // get all attachment posts.
    $attachments = get_posts([
        'post_type' => 'attachment',
        'post_status' => 'inherit',
        'name' => $p->slug,
        'posts_per_page' => -1,
    ]);

    // For each attachment, loop and update the post_name
    foreach($attachments as $p){

        $attachment = array(
            'ID'           => $p->ID,
            'post_name' => $p->post_name.'-image'
        );
        // Update the post into the database
        wp_update_post( $attachment );

    }

    // Once everything is looped, add the option to the database.
    add_option( 'images_updated', 'true' );
}

add_action( 'after_setup_theme', 'wp21418_append_to_post_name' );