deprecated argument errors fix

Nice plugin, but needs some compatibility adjustments for newer WP.

I’m getting the debug.log [WP_DEBUG=1] filled with these every time a theme color is changed:

options.php was called with an argument that is deprecated since version 2.7.0! The _colorthemeadmin setting is unregistered. Unregistered settings are deprecated. 
options.php was called with an argument that is deprecated since version 2.7.0! The _colorthemeadmintop setting is unregistered. Unregistered settings are deprecated.
options.php was called with an argument that is deprecated since version 2.7.0! The _colorthemeadminwptop setting is unregistered. Unregistered settings are deprecated.
options.php was called with an argument that is deprecated since version 2.7.0! The _colorthemeadminmain setting is unregistered. Unregistered settings are deprecated.

How to get rid of those warnings is explained here:
https://codex.ww.wp.xz.cn/Creating_Options_Pages

Options have to be registered first. I put that reg here:

\plugins\colorize-admin\inc\settings.php ~line 4

if( is_admin() ) add_action( 'admin_init', 'register_colorthemeadmin_settings' );
function register_colorthemeadmin_settings() { // whitelist options
  register_setting( 'colorthemeadmin', '_colorthemeadmin' );
  register_setting( 'colorthemeadmin', '_colorthemeadmintop' );
  register_setting( 'colorthemeadmin', '_colorthemeadminwptop' );
  register_setting( 'colorthemeadmin', '_colorthemeadminmain' );
}

Then the form needs to be submitted differently:

\plugins\colorize-admin\inc\admin-options.php after the opening form tag in line 35:

<form method="post" action="options.php" id="htmlForm">
<?php settings_fields( 'colorthemeadmin' ); ?>
<?php do_settings_sections( 'colorthemeadmin' ); ?>
<?php //wp_nonce_field('update-options'); ?>

HTH.

Thanks.