2.4.0

• Design: add "Custom CSS" setting; Finally! :)
• Design: add "Footer links" color setting
• Design: add a list of available shortcodes under the "Text" editor
• Bot: make {visitor_name} placeholder work in all messages after the visitor types his name
• Misc: add [embed] shortcode for responsive video embeds; Compatible with YouTube, Vimeo, DailyMotion.
• Misc: make the exclude mechanism work with Cyrillic characters
• Misc: add wpmm_maintenance_template filter; It works the same way as the wpmm_contact_template filter, but for the maintenance template.
• Misc: now you can override the contact email template too; Check /views/contact.php for more details.
• Misc: better compatibility with translation plugins like Loco Translate
• Misc: the image uploaders (from the dashboard) are now translatable
• Misc: improve uninstall routine
• Misc: add wpmm_delete_cache action; It is called after each setting change.
• Misc: add support for cache plugins like WP Rocket, WP Fastest Cache, Endurance Page Cache, Swift Performance Lite, Cache Enabler, SG Optimizer, LiteSpeed Cache, Nginx Helper;
• Misc: remove wpmm_count_where helper function
• Misc: code improvements