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/notifications/notifications.h

@@ -0,0 +1,67 @@
+#pragma once
+
+#include <string>
+#include <string_view>
+#include <vector>
+#include <variant>
+#include <optional>
+
+namespace notifications
+{
+    constexpr inline const wchar_t TOAST_ACTIVATED_LAUNCH_ARG[] = L"-ToastActivated";
+    constexpr inline const wchar_t UPDATING_PROCESS_TOAST_TAG[] = L"PTUpdateNotifyTag";
+
+    void override_application_id(const std::wstring_view appID);
+    void register_background_toast_handler();
+    void run_desktop_app_activator_loop();
+
+    bool register_application_id(const std::wstring_view appName, const std::wstring_view iconPath);
+    void unregister_application_id();
+
+    struct snooze_duration
+    {
+        std::wstring label;
+        int minutes;
+    };
+
+    struct snooze_button
+    {
+        std::wstring snooze_title;
+        std::vector<snooze_duration> durations;
+        std::wstring snooze_button_title;
+    };
+
+    struct link_button
+    {
+        std::wstring label;
+        std::wstring url;
+        bool context_menu = false;
+    };
+
+    struct background_activated_button
+    {
+        std::wstring label;
+        bool context_menu = false;
+    };
+
+    struct progress_bar_params
+    {
+        std::wstring progress_title;
+        float progress = 0.f;
+    };
+
+    struct toast_params
+    {
+        std::optional<std::wstring_view> tag;
+        bool resend_if_scheduled = true;
+        std::optional<progress_bar_params> progress_bar;
+    };
+
+    using action_t = std::variant<link_button, background_activated_button, snooze_button>;
+
+    void show_toast(std::wstring plaintext_message, std::wstring title, toast_params params = {});
+    void show_toast_with_activations(std::wstring plaintext_message, std::wstring title, std::wstring_view background_handler_id, std::vector<action_t> actions, toast_params params = {});
+    void update_toast_progress_bar(std::wstring_view tag, progress_bar_params params);
+    void update_toast_contents(std::wstring_view tag, std::wstring plaintext_message, std::wstring title);
+    void remove_toasts(std::wstring_view tag);
+}