Impl sceSystemServiceLoadExec (#3647)

* Add support for restarting the emulator with new configurations

- Implement `Restart` function in `Emulator` to enable process relaunch with updated parameters.
- Modify `sceSystemServiceLoadExec` to use the restart functionality.

* Add logging for emulator restart and system service load execution

* Add IPC emulator PID output command

Impl `PID` output command to return the emulator process ID
- required for launches supporting emulator restart

* Add log file append mode support (used after restarting to keep the same log file)

* Keep game root between restarts

* add --wait-for-debugger option flag

* add --wait-for-pid flag

used for sync between parent & child process during restart

* impl restart via ipc

* fix override game root

* add qt flags to allow restart

src/emulator.h

@@ -4,6 +4,7 @@
 #pragma once
 
 #include <filesystem>
+#include <optional>
 #include <thread>
 
 #include "common/singleton.h"
@@ -25,9 +26,19 @@ public:
     Emulator();
     ~Emulator();
 
-    void Run(std::filesystem::path file, const std::vector<std::string> args = {});
+    void Run(std::filesystem::path file, std::vector<std::string> args = {},
+             std::optional<std::filesystem::path> game_folder = {});
     void UpdatePlayTime(const std::string& serial);
 
+    /**
+     * This will kill the current process and launch a new process with the same configuration
+     * (using CLI args) but replacing the eboot image and guest arguments
+     */
+    void Restart(std::filesystem::path eboot_path, const std::vector<std::string>& guest_args = {});
+
+    const char* executableName;
+    bool waitForDebuggerBeforeRun{false};
+
 private:
     void LoadSystemModules(const std::string& game_serial);