File locking and DevelopmentService improvements (#358)

- Moved `file::getlock(path)` from `Tactility` to `TactilityCore`
- Changed all existing `file::*` functions to implement locking by default
- Removed all manual locking where `file::*` functions were used
- When `DevelopmentService` receives a file, it doesn't try to allocate it all in memory. This fixes going out-of-memory on devices without PSRAM.
- Fix for TactilityC include

TactilityC/Include/tt_app.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#include <cstdio>
+#include <stdio.h>
 
 #include "tt_app_manifest.h"
 

TactilityC/Source/tt_file.cpp

@@ -1,6 +1,6 @@
 #include <tt_file.h>
 #include <tt_lock_private.h>
-#include <Tactility/file/FileLock.h>
+#include <Tactility/file/File.h>
 
 extern "C" {