Install Class to methods

- Bugfixing Install checks (worked not as expected)
- Changed static methods from Install to class functions
- Added tests

tests/src/Core/Console/ConsoleTest.php

@@ -50,7 +50,6 @@ abstract class ConsoleTest extends TestCase
 	}
 
 	public function execute($args) {
-		DBA::disconnect();
 		$this->app->reload();
 
 		array_unshift($args, $this->getExecutablePath());