Add Polaris Chord Support (#361)

## Link to GitHub Issue, if one exists
n/a

## Description of change
Adds support for Polaris Chord

## Testing
Tested with XIF:J:A:A:2024122300. IO/ICCA works, game successfully
connects to server and is playable.

src/spice2x/games/pc/pc.h

@@ -0,0 +1,16 @@
+#pragma once
+
+#include "games/game.h"
+
+namespace games::pc {
+    extern std::string PC_INJECT_ARGS;
+    extern bool PC_NO_IO;
+
+    class PCGame : public games::Game {
+    public:
+        PCGame() : Game("Polaris Chord") {}
+
+        virtual void attach() override;
+        virtual void detach() override;
+    };
+}