- Add L10n::init() call in App constructor
- Improve pushLang/popLang
- Remove no longer needed references to App

- Remove duplicate calls to Addon::loadHooks and Config::load
- Remove useless killme() call

- renamed a lot of App methods to CamelCase
- replaced direct public variables with get-/set-Methods

* Adding Argument class to Friendica

* Adding Argument class to Friendica

* Adding Argument class to Friendica

* fixing arguments for `spawnWorker`

* Adding `use Friendica\BaseObject` to `ApiTest.php`

* Refactoring the argument-usages of Friendica

* Refactoring the argument-usages of Friendica

* removing superfluous []

Extracted install business functions to new Class `Install.php`

Update function names and calls for Addon class.

- Initializes $return in Process::insert
- Update the type hint of dba::fetch
- Remove unused $a parameter in worker_init()
- Fix uses

- Add start|endProcess functions to Core\Worker