switch to INI for settings (easier), make settings a singleton thingy, slightly simplify core pause/stop/reset. Drop support for remappable inputs for now

src/frontend/SettingsWindow.cpp

@@ -2,13 +2,13 @@
 #include <fmt/core.h>
 #include <nfd.hpp>
 #include <log.hpp> 
-#include <JSONUtils.hpp>
+#include <Options.hpp>
 
 std::string savePath;
 
-SettingsWindow::SettingsWindow() : settings{JSONOpenOrCreate("resources/settings.json")}, cpuSettings{settings}, audioSettings{settings} {
+SettingsWindow::SettingsWindow() {
   savesFolder.setName(fmt::format("Save path: {}",
-                      JSONGetField<std::string>(settings, "general", "savePath")));
+                      Options::GetInstance().GetValue<std::string>("general", "savePath")));
 
   tabs.addTab({"General", [&]() {
     if(savesFolder.render()) {
@@ -22,7 +22,7 @@ SettingsWindow::SettingsWindow() : settings{JSONOpenOrCreate("resources/settings
         Util::panic("Error: {}", NFD::GetError());
 
       savesFolder.setName(fmt::format("Save path: {}", outPath.get()));
-      JSONSetField(settings, "general", "savePath", outPath.get());
+      Options::GetInstance().SetValue<std::string>("general", "savePath", outPath.get());
       apply.setEnabled(true);
     }
   }}); 
@@ -48,9 +48,7 @@ SettingsWindow::SettingsWindow() : settings{JSONOpenOrCreate("resources/settings
 
     if(apply.render()) {
       apply.setEnabled(false);
-      std::ofstream file("resources/settings.json");
-      file << settings;
-      file.close();
+      Options::GetInstance().Apply();
     }
   
     ImGui::SameLine();