Reworked as a PHAR file.
This is a new, more maintainable version of Akeeba Kickstart. Instead of trying to shoehorn an entire application inside a single, long PHP file we are no delivering it as a compressed PHAR archive. It still has a .php extension so it can be executed directly as a web script or a command line application even on servers where PHAR support is disabled. This is possible thanks to a special executable "stub" at the start of the file which extracts the application into a temporary directory (using the same kicktemp folder that's already documented) before executing it. On servers which do have the PHP PHAR extension enabled the file will instead execute as a native PHP PHAR archive, with even better performance. The new packaging format allows us to have a more sane and maintainable directory structure which will allow us to better support Kickstart in the future, especially with necessary changes to address backwards incompatible changes in upcoming PHP versions.