Disables all XML-RPC functions

• removed redundant xmlrpc_methods filter
• fixed "dummy" CSS class to hide discussion settings reliably
• improved code formatting and hook order
• added Tested up to plugin header
• added Update URI plugin header
• added Text Domain plugin header

• added Requires PHP plugin header
• improved gu_override_dot_org snippet

• fixed gu_override_dot_org snippet

• completely refactored to WordPress standards
• several new snippets to further disable XML-RPC calls and methods
• support for Git Updater
• spport for PHP 7.0 to 8.3
• support for Multisite

• updated recommended plugins

• tested with WP 5.0

• updated recommended plugins

• optimized plugin code
• added warning for Multisite installations
• updated recommended plugins
• updated plugin meta

• updated recommended plugins

• better support for DISABLE_NAG_NOTICES

• tested with WP 4.9
• updated plugin meta
• partial support for DISABLE_NAG_NOTICES

• optimized plugin code
• updated recommended plugins
• added rating request notice

• optimized plugin code
• updated recommended plugins

• added recommended plugins notice

• initial release