logger: show message popup for log_fatal (#412)

## Link to GitHub Issue, if one exists
#410 

## Description of change
When raising fatal errors via `log_fatal`, also show a modal popup.

Update instances of `log_fatal` where the message was too long to fit.

## Testing
Tested various failure conditions.

src/spice2x/util/logging.cpp

@@ -1,6 +1,10 @@
-#include "logging.h"
+#include <atomic>
+#include <chrono>
+#include <future>
 
-DWORD LOG_FATAL_SLEEP = 10000;
+#include "logging.h"
+#include "build/defs.h"
+#include "hooks/graphics/graphics.h"
 
 std::string_view log_get_datetime() {
     return log_get_datetime(time(nullptr));
@@ -14,3 +18,66 @@ std::string_view log_get_datetime(std::time_t now) {
 
     return buf;
 }
+
+static void show_popup(const std::string text) {
+    static std::once_flag shown;
+    std::call_once(shown, [text]() {
+
+        // minimize all windows
+        // only needed because in multi-monitor full screen games, MessageBox fails to show above the game
+        for (auto &hwnd : GRAPHICS_WINDOWS) {
+            ShowWindow(hwnd, SW_FORCEMINIMIZE); 
+        }
+
+        // schedule a worker to terminate the game in 30 seconds in case user can't dismiss UI
+        std::atomic_bool cancel_popup = false;
+        auto worker = std::async(std::launch::async, [&cancel_popup]{
+            for (int ms = 300; ms > 0; ms--) {
+                std::this_thread::sleep_for(std::chrono::milliseconds(100));
+                if (cancel_popup) {
+                    return;
+                }
+            }
+            launcher::stop_subsystems();
+            launcher::kill();
+            std::terminate();
+        });
+
+        // MessageBox will block until user presses OK
+        const std::string title = "spice2x (" + to_string(VERSION_STRING_CFG) + ")";
+        MessageBox(
+            nullptr,
+            text.c_str(),
+            title.c_str(),
+            MB_OK | MB_ICONERROR | MB_TASKMODAL | MB_SETFOREGROUND | MB_TOPMOST);
+
+        // cancel the worker since the user acknowledged the popup
+        cancel_popup = true;
+    });
+}
+
+void show_popup_for_crash() {
+    std::string text;
+    text += "Game has crashed.\n\n";
+    text += "Check log.txt and look for error messages near the end of file.\n\n";
+    text += "Unsure what to do next?\n";
+    text += "  * update spice2x to the latest version\n";
+    text += "  * check the FAQ on spice2x github wiki\n";
+    text += "  * do NOT screenshot this, instead, share log.txt with someone and ask for help\n\n";
+    text += "Press Enter, Esc, Alt+F4, or click OK to exit. Otherwise, game will close in 30 seconds.";
+    show_popup(text);
+}
+
+void show_popup_for_fatal_error(std::string message) {
+    std::string text;
+    text += "A fatal error was encountered. For details, check log.txt.\n\n";
+    text += "----------------------------------------------------------\n";
+    text += message;
+    text += "----------------------------------------------------------\n\n";
+    text += "Unsure what to do next?\n";
+    text += "  * update spice2x to the latest version\n";
+    text += "  * check the FAQ on spice2x github wiki\n";
+    text += "  * do NOT screenshot this, instead, share log.txt with someone and ask for help\n\n";
+    text += "Press Enter, Esc, Alt+F4, or click OK to exit. Otherwise, game will close in 30 seconds.";
+    show_popup(text);
+}