common: refactor common library pt2 (#8588)

- remove common lib
- split settings, remove common-md
- move ipc interop/kb_layout to interop
- rename core -> settings, settings -> old_settings
- os-detect header-only; interop -> PowerToysInterop
- split notifications, move single-use headers where they're used
- winstore lib
- rename com utils
- rename Updating and Telemetry projects
- rename core -> settings-ui and remove examples folder
- rename settings-ui folder + consisent common/version include

src/common/SettingsAPI/settings_helpers.h

@@ -0,0 +1,17 @@
+#pragma once
+#include <string>
+#include <Shlobj.h>
+
+#include "../utils/json.h"
+
+namespace PTSettingsHelper
+{
+    std::wstring get_module_save_folder_location(std::wstring_view powertoy_name);
+    std::wstring get_root_save_folder_location();
+
+    void save_module_settings(std::wstring_view powertoy_name, json::JsonObject& settings);
+    json::JsonObject load_module_settings(std::wstring_view powertoy_name);
+    void save_general_settings(const json::JsonObject& settings);
+    json::JsonObject load_general_settings();
+    std::wstring get_log_settings_file_location();
+}