Refactor FastCGI server and compiler, enhance HTTP header parsing, and add WebSocket support

- Refactored FastCGIServer class to improve socket handling and added shutdown functionality.
- Updated compiler functions to streamline HTML and text literal processing.
- Enhanced split_kv function to support uppercase keys and added split_http_headers for better HTTP header parsing.
- Introduced new session management functions to validate and handle session IDs.
- Added WebSocket frame parsing and handling in the URI module.
- Created systemd service scripts for easier deployment and management of the UCE FastCGI runtime.
- Added new test cases for header handling, time parsing, and WebSocket functionality.

doc/pages/ob_close.txt

@@ -0,0 +1,11 @@
+:sig
+void ob_close()
+
+:params
+(none)
+
+:desc
+Discard the current output buffer. If are more output buffers on the stack, switch to the next one.
+
+:see
+>ob