updated phpseclib to 2.0.4

Use composer installed phpseclib

We used to ship only parts of phpseclib in inc/phpseclib which made it a
little tricky to update. This replaces the library with a composer
installed version, making

Use composer installed phpseclib

We used to ship only parts of phpseclib in inc/phpseclib which made it a
little tricky to update. This replaces the library with a composer
installed version, making the rest of the library available to plugin
authors. It might fix a problem with PHP 7.1 as reported in #1682
(unconfirmed)

show more ...

updated GeSHi to v1.0.8.17

updated php-archive to 1.0.7 fixes #1296

fixed #1249 by upgrading php-archive to 1.0.4

updated archive library via composer

geshi update via composer

switched geshi higlighter to composer based repository

added composer setup and the first composer package php-archive