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/bi2x_hook.h

@@ -0,0 +1,5 @@
+#pragma once
+
+namespace games::pc {
+    void bi2x_hook_init();
+}