Multiple fixes

* Implemented ScriptRunner with environment expansion and cleaner
  code.
* Added ApiClient plugin (com.noccy.apiclient)
* Renamed CHANGELOG.md to VERSIONS.md
* Shuffled buildtools
* Added first unittests

src/Commands/RunCommand.php

@@ -34,7 +34,9 @@ class RunCommand extends Command
             }
             return Command::SUCCESS;
         } elseif ($script = $input->getArgument('script')) {
-            $env->runScript($script, $args, $input, $output);
+            $runner = $env->getScriptRunner();
+            //$env->runScript($script, $args, $input, $output);
+            $runner->evaluateDefinedScript($script); // args?
         }
 
         return Command::SUCCESS;