افزونه 2 Browser Detection 2.4.0

• Restore XF2.1 support
• Update Mobile Detect from v3.74.3 => v4.8.06.
  Note; this is a fork which retains php 7.2 compatibility

• Implement caching wrapper around Mobile_detect::match calls.
• Forward unknown function calls to the wrapped Mobile_detect instance

• 3rd party add-on compatibility fix, rework how html element css injection works

• Update MobileDetect library to v2.8.37