Cool Timeline (Horizontal & Vertical Timeline)

Medium risk: 3 removed asset handles, 2 removed functions, 2 removed methods.

• The action ctl_after_timeline_header is no longer fired. Any code hooked to it stops running silently.
• The function cool_plugins_timeline_addons_settings_page() was removed. Direct calls from a theme or another plugin will fatal.
• The function ctl_demo_page_content() was removed. Direct calls from a theme or another plugin will fatal.
• CoolTimeline::ctl_add_new_item() was removed.
• CoolTimeline::ctl_enqueue_addon_fonts() was removed.
• The class cool_plugins_timeline_addons was removed. Code that instantiates or extends it will fatal.
• The AJAX action wp_ajax_ctl_dashboard_install_plugin was removed.
• The script/style handle cool-plugins-inter-font is gone. Code that dequeues, or declares a dependency on, that handle is now wrong.
• The script/style handle cool-plugins-timeline-addon is gone. Code that dequeues, or declares a dependency on, that handle is now wrong.
• The script/style handle cool-plugins-timeline-addon-menu-icon is gone. Code that dequeues, or declares a dependency on, that handle is now wrong.
• New external hostnames appear in this release: i.ytimg.com, img.youtube.com.