Corrected namespaces + Chnaged tab size to 4

+ Went through all the Model classes and updated their namespaces to match their parent folder name
+ Changed tab sizes to 4 spaces instead of 2 (in all php files)

src/Api/Organizations.php

@@ -5,7 +5,7 @@ namespace Gitea\Api;
 use GuzzleHttp\Psr7\Response;
 
 use Gitea\Client;
-use Gitea\Models\Organization;
+use Gitea\Model\Organization;
 
 use Gitea\Api\Abstracts\AbstractApi;