Redo how the remote filesystem works

Instead of reading files over the network, the new version uses a local file cache and only updates files when it changes.

The original remote filesystem was created 14 years ago, when ethernet was faster than hard drives or even flash. Also, mobile devices have a very small amount of storage.
Nowadays, this is no longer the case so the approach is changed to using a persistent cache in the target device.

core/config/project_settings.cpp

@@ -36,7 +36,6 @@
 #include "core/io/config_file.h"
 #include "core/io/dir_access.h"
 #include "core/io/file_access.h"
-#include "core/io/file_access_network.h"
 #include "core/io/file_access_pack.h"
 #include "core/io/marshalls.h"
 #include "core/os/keyboard.h"
@@ -502,17 +501,6 @@ Error ProjectSettings::_setup(const String &p_path, const String &p_main_pack, b
 		}
 	}
 
-	// If looking for files in a network client, use it directly
-
-	if (FileAccessNetworkClient::get_singleton()) {
-		Error err = _load_settings_text_or_binary("res://project.godot", "res://project.binary");
-		if (err == OK && !p_ignore_override) {
-			// Optional, we don't mind if it fails
-			_load_settings_text("res://override.cfg");
-		}
-		return err;
-	}
-
 	// Attempt with a user-defined main pack first
 
 	if (!p_main_pack.is_empty()) {