Composer-Setup 5.0.0

• Improved the Chocolatey package release process to use their automatic update module.
• Added the curl extension to php.ini modifications which will be needed in Composer 2.
• Updated to Inno Setup 6 which provides a modern resizable interface and drops support for Windows XP.
• Restricted PHP to 5.5 upwards because lower versions do not use the TLS protocols required to
  download the installer and connect to Packagist.
• Removed the security page that allowed the user to disable TLS.
• Improved wording on environment changes page: #103
• Updated the installer script to recognize the HTTPS_PROXY and NO_PROXY environment variables and to include certificate data from Wed Oct 16 03:12:09 2019 GMT.
• Improved proxy display and handling, which nows allows the user to override settings from
  Internet Options: #91
• Fixed crash caused by Inno Setup 5 bug when calling ExpandUNCFileName with a path longer than 259 characters. This occured when a user had an entry named %PATH% in their Path environment variable, so Setup now checks for the path separator in an expanded path: #92.
• Improved extension enabling in php.ini so that only the extension name is used for PHP7.2 upwards.
• Improved search for common PHP locations.