* [Slim] Decouple Api files into separated PHP Classes
This enhancement required for modular testing and code coverage generating.
* [Slim] Define all app routes in SlimRouter PHP Class. Generate new samples
* [Slim] Shell script points to petstore-with-fake-endpoints-models-for-testing.yaml. Slim init and new models has been generated.
* [Slim] Bugfix. Special value */* in opperation produces escaped to avoid PHP syntax errors.
* [Slim] Add own private static final LOGGER
* [Slim] Bugfix. toModelName method copied from PHPClient codegen which handles Fake Petstore spec much better.
* [Slim] Sort operations in supporting files data to avoid shadowing static routes.
* [Slim] Mustache index.php update. Params parsing enhanced.
* [Slim] Tiny cleanup. Unnecessary empty space removed.
* [Slim] Security fix. toOperationId method copied from PhpClientCodegen.
* [Slim] Bugfix. formData params parsing restored.
* [Slim] Proper .gitignore added to PhpSlimServerCodegen. Vendor folder with all dependencies removed to keep repo more clean.
* [Slim] Slim dependency update to 3.10.0. Few test fake endpoints fixed by this upgrade.
