Sim GUI: Support High DPI monitors

Add user setting for scaling on top of DPI scaling.
Add user setting for visual style (light/dark/normal).
Save window position, size, maximized state, scale, and style to ini file.

simulation/halsim_gui/src/main/native/cpp/DIOGui.cpp

@@ -56,7 +56,7 @@ static void DisplayDIO() {
     }
   }
 
-  ImGui::PushItemWidth(100);
+  ImGui::PushItemWidth(ImGui::GetFontSize() * 8);
   for (int i = 0; i < numDIO; ++i) {
     if (HALSIM_GetDIOInitialized(i)) {
       hasAny = true;