Fixes to ssl/tls, misc improvements

* Use the PHP context options to configure tls rather than reinventing
  the wheel.
* Properly setup the SocketServer for ssl
* Added generic getter for config values

src/Configuration.php

@@ -41,6 +41,24 @@ class Configuration
         return $config;
     }
 
+    /**
+     * Retrieve a key from the configuration. If the key ends with a dot, all values
+     * with keys starting with the requested key are returned. If the key is a single 
+     * dot, all keys are matched and all values returned.
+     * 
+     * @param string $key
+     * @param mixed $default Default value
+     * @return mixed
+     */
+    public function get(string $key, $default = null): mixed
+    {
+        if ($key === '.')
+            return $this->config;
+        if (str_ends_with($key, "."))
+            return array_filter($this->config, fn($k)=>str_starts_with($k,$key), ARRAY_FILTER_USE_KEY);
+        return $this->config[$key] ?? $default;
+    }
+
     public function setPublicUrl(string $publicUrl): self
     {
         $this->config['server.public_url'] = $publicUrl;