Create core version of the theme

My plan is to work on contrib version of Corolla theme for now, and split it several days before the deadline (17 May). The process should be straightforward as it is mostly about removing stuff. Below is the list of features that are currently available in RC1 revision but will have to be removed in Drupal 7 core patch:

1. Drop-down menus
- remove corolla_preprocess_page() function from template.php
- replace $main_links variable with $main_menu in page.tpl.php
- remove additional styles from page.css
2. Custom layout settings
- merge following templates: page.tpl.php, page-content.tpl.php, page-sidebar-first.tpl.php and page-sidebar-second.tpl.php
- remove $weight and $main_columns_number variables from page.tpl.php and their definitions from template.php
- remove unnecessary wrappers from page.tpl.php
3. Custom implementation of contextual links
- remove contextual.js file
- remove "scripts[] = contextual.js" line from corolla.info
- remove stylings for contextual links module from modules.css
- remove lines from corolla_css_alter() function in template.php that are disabling core stylesheets for contextual links
4. Footer link to my website
- remove it from page.tpl.php
- remove stylings for div#theme-info from page.css